SAN FRANCISCO (AP) — DoorDash is expanding its offerings, adding restaurant reservations and robot deliveries in some U.S. markets. The…SAN FRANCISCO (AP) — DoorDash is expanding its offerings, adding restaurant reservations and robot deliveries in some U.S. markets. But DoorDash Co-Founder Stanley Tang said the company needs more delivery options to help fuel its future growth. DoorDash also said Tuesday it will soon begin providing deliveries in Phoenix with an autonomous robot. Tang said DoorDash has already made hundreds of successful deliveries with Dot during the past few months in the greater Phoenix area.