Query: user: Can you search for round trip flights traveling to SFO?
assistant: From where will you be leaving from?
user: I will be leaving from Vancouver.
assistant: When do you plan to leave? When are you going to be back?
user: I am leaving on the 9th and coming back on the 11th.
assistant: There is a Delta Airlines outbound flight leaving at 5:05 pm. The return flight leaves at 5:45 pm. This ticket costs $121.
user: That flight sounds good.
assistant: May I help with anything else?
user: Can you help buy the flight tickets? I would like 3 tickets and for us to travel Economy.

Intent: Flights:ReserveRoundtripFlights