Thank Dara. We are continuing with our financial results. I wanted to describe some of the changes we've made to our report. We now provide greater visibility into our business by reporting on five segments. For each of these segments, we're providing gross bookings, revenue, adjusted net revenue, segment adjusted EBITDA. Our historical total company results remain unchanged. Our segment adjusted EBITDA measures replace, it was previous reported of contribution profit and loss and maintains the same definition and includes all the segment's direct cost with contra revenue, cost of revenue, support and operations, sales and marketing and G&A and R&D directly related to these respective segments, which represents a majority of our total G&A and R&D spend. The further information on these changes and to address any questions on bridging our old and new segments, please see the supplemental slides posted on investor.uber.com. For the remainder of this discussion, all growth rates reflect year-over-year growth unless otherwise noted. Now on to our GAAP results for Q3, 2019. Our GAAP revenue was $3.8 billion, up 30%. GAAP cost per revenue excluding G&A of $1.9 billion decreased 48.8% from 51.3% of revenue in Q3, 2019. GAAP EPS was a loss of $0.68 compared to a loss of $2.21 in Q3 of 2018. For the remainder of the call unless otherwise noted, I will discuss key operational metrics as well as non -GAAP financial measures excluding pro forma adjustments such as stock based compensation and the one-time driver appreciation award associated with the IPO in the second quarter of 2019. Our total company global trips of 1.8 billion grew 31%. Global trip growth continues to be a significant driver of our overall growth in gross bookings. MAPC or Monthly Active Platform consumers were 103 million, up 26%. We continue to see strong new MAPC additions to the platform via Eats and rides. Total company gross bookings were $16.5 billion growing 29% or 32% on a constant currency basis. Adjusted net revenue or ANR was $3.5 billion which is up 35% on a constant currency basis. Our ANR take rate was 21.5% of gross bookings, up 60 basis points year-over-year and a 140 basis points quarter-over-quarter. non-GAAP cost of revenues excluding G&A decreased to 45% and 47% of ANR, and decreased to 9.7% from 9.9% as a percentage of gross bookings. Insurance and payment as a percent of the gross bookings improved quarter-over-quarter and year-over-year. This is partially offset by an increase in cost of revenue due to freight and NeMo's gross or merchant's model, where freight partner payments and NeMo's scooter hardware and field costs are included in our cost of revenue. Turning now to non-GAAP operating expenses. First, I'll start with operations and support and sales and marketing which are 100% allocated to our five business segments. Operations and support was stable at 13% of adjusted net revenue and has been stable at 3% of gross booking since the third quarter of 2018, reflecting ongoing rides, support efficiency improvements, offset by mix shift a higher percentage of Eats transactions which carry with them a higher contact rate. Going forward, we will look to automate a higher percentage of Eats customer service tickets and are already seeing reductions in contact rates month-over- month. Sales and marketing increased to 30% from 28% of adjusted net revenue and increased to 6.5% from 5.9% of gross bookings versus a third quarter of 2018. This increase was primarily due to increase consumer promotions as well as increased advertising and marketing spend prior to our Q3 headcount reduction. R&D decreased to 13% from 14%, and adjusted net revenue decreased to 2.8% and 3% of gross booking due to slower growth in ETG expenses. We expect to get leverage on total R&D over the long term. G&A was flat at 15% of adjusted net revenue and remained flat at 3.1% of gross booking versus Q3 of 2018. It was flat as a percentage of our top line as a result of public company infrastructure investment. We expect that G&A will grow significantly more close than our top line. Our Q3, 2019 total adjusted EBITDA loss was $585 million. We handily beat our internal plan due to strong execution of our scheme; we know we have a lot more work to do here and will need focus on balancing investment with profitability improvement. Now I'll provide additional detail on our segments. First on the Rides side. Rides gross bookings of $12.8 billion grew 22% at constant currency led by the US and LATAM respectively. Rides ANR of $2.9 billion grew 24% at constant currency driven by more favorable market dynamics in the US, stability in LATAM beginning in the 2019 and improved share of rise efficiency. Rides adjusted EBITDA was $631 million or 22% of Rides ANR. This represented a quarterly record on absolute dollars and margins basis, with 270 basis point and 420 basis point margin improvements quarter-over-quarter and year-over-year respectively, as the percentage of ANR. During Q3, 2019, the adjusted EBITDA margins for the top five Rides countries by gross bookings range from 17% to 62% as a percent of ANR. There's nothing structurally different about the highest margin country that would prevent other countries from matching as market dynamics become more favorable over time. On each gross booking of $3.7 billion grew 77% at constant currency driven by growth in APAC and US and Canada which was our largest absolute dollar growth driver by category growth slowing in some core metros. Eats ANR was $392 million, up 109% on a constant currency basis through the ongoing benefit from the service fee structure launched in the US in Q1 of 2019. These adjusted EBITDA was a loss of $316 million or negative 81% of ANR and negative 8.6% of gross bookings. We have nearly a 100 Eats cities that are adjusted EBITDA margin positive, with that said given the large private capital inflows into the online food delivery category, competition has been fierce in some markets. To underscore the levels of promotion and incentives by privately funded players approximately 15% of our Eats gross booking make up over half of our adjusted EBITDA margin loss. Our decision recently to exit the South Korean market demonstrates our willingness to exit markets with low ROI. Our freight business grew ANR over 78% and adjusted EBITDA was a loss of $81 million. Freight growth was driven by load volume increases over 100% in spite of soft market conditions. Rate continues to rapidly take share in the large US market, while providing excellent service that lays the groundwork for long term shipper partnerships. Our team continues to automate what was high-touch, phone driven tasks to scale our enterprise relationships and increasingly our self-serve, small super platform and to expand our carrier footprint across individual, as well as fleet owners. Our Other Bets segment had ANR of $38 million and an adjusted EBITDA loss of $72 million. Other Bets which consist primarily of our JUMP e-bikes and scooters continue to be a strong consumer acquisition channel. We also continue to achieve improvements to unit economics. ATG adjusted EBITDA was a loss of a $124 million based on this quarter's level of investment the recent $1 billion investment in ATG covers about eight quarters of spend. The first engineers from Toyota and Denso are now co-located with our ATG teams in Pittsburgh demonstrating Toyota's commitment to this partnership. We also announced that ATG will begin manual testing and mapping in Dallas in early November. In Q3, 2019 corporate G&A and platform R&D of $623 million which represents the G&A and R&D not allocated to one of our five segments grew 24%. This is made up of G&A and engineering functions that support the entire platform, including infrastructure payments brand and customer support technologies. In terms of liquidity, we ended the quarter with approximately $12.7 billion in unrestricted cash and cash equivalent, an increase of $1 billion over last quarter. The increase was driven by the $1 billion in aggregate proceeds from the investment in ATG and proceeds from our $1.2 billion senior notes offering which closed in September. Now I'll wrap up providing guidance and comments. We are narrowing our 2019 gross bookings to a constant currency growth of 33% to 35% year-over-year, up from the 31% to 35% year-over-year guidance given on the second quarter conference call. Based on September month end rates, our current constant currency growth represents about $64 billion to $65 billion in reported gross bookings. Please note that we expect to provide 2020 annual guidance on our Q4, 2019 earnings call. For your modeling purposes, please keep in mind that our largest foreign currencies are the Brazilian reals, the UK pound, Australian dollar, Mexican pesos, Canadian dollar, euro, Indian rupee and Argentinian peso. Given the rapid improvement in Rides take rates through Q3, 2019, we do not expect typical Q4 seasonality to cause quarter-over-quarter decline in take rate. The Eats market will continue to be competitive as players of raised funds to invest in growth in this fast-growing category. We will continue to invest including in Q4, 2019 when seasonal courier cost increase and we expect category take rates to contract quarter-over-quarter. We expect adjusted net revenue growth rates to continue to accelerate into Q4 coming in close to 40%. For 2019 adjusted EBITDA, we now expect the loss of $2.9 billion to $2.8 billion, reflecting a $250 million improvement at the midpoint from prior guidance of 3.2 to 3.0. We are also providing additional guidance. For the fourth quarter of 2019, stock based compensation, we expect the expense of $250 million to $300 million and we expect our Q4, 2019 basic and diluted weighted average share count to be 1.7 billion to 1.725 billion. As we finalize our 2020 plan, we remain particularly focused on identifying additional operating efficiencies across all of our operating expenses. While we will continue to invest in our business to achieve long term top line growth as Dara mentioned, we are targeting EBITDA profitability on a fully consolidated basis for the full year 2021. We will confirm our 2020 guidance on our Q4 call. With that let's open it up for questions.