Query: user: Please find me a round trip flights in United Airlines.
assistant: Where are you going and where you coming from?When do you plan to go back?
user: I am planning to go to Vancouver BC from Atlanta. I want to get back on March 11th.
assistant: When you will leave?
user: On 3rd of this month.
assistant: Okay, you want 1 flight with United Airlines for only $248 with an outbound flight leave at 6:15 am and return flights at 3:15 am. Please confirm.
user: Which airport it will arrive?
assistant: At YVR International Airport.
user: That's good.
assistant: Will I buy you tickets now?
user: Yes.

Intent: Flights:ReserveRoundtripFlights