Query: user: Can you please find me some one-way flights to LA?
assistant: When do you plan to leave?
user: I am leaving on March 12th.
assistant: Where are you leaving from?
user: I'm leaving from Phoenix, AZ.
assistant: I found 4 flights for you. There us an American Airlines flight that leaves at 7:35 am and has 0 layovers. The price per ticket is $96.
user: Are there any other available flights? I am leaving from Seattle, WA and I need 1 ticket.
assistant: There is an Alaska Airlines flight leaving at 3:45 pm and has 0 stops. The price per ticket is $123.
user: Which airport does it depart from?
assistant: The flight departs from Seattle-Tacoma International Airport.
user: That sounds good.
assistant: Shall I book the tickets?
user: No thank you.
assistant: Shall I help you with anything else?
user: Can you search round trip flights, in economy?
assistant: When are you coming back?
user: I would like to return on the 14th of this month. I want the tickets to be refundable.
assistant: There is an Alaska Airlines flight leaving at 3:45 pm and a return flight at 7:10 pm. The price per ticket is $137.
user: That flight sounds good.
assistant: Should I buy the tickets?
user: Yes please.

Intent: Flights:ReserveRoundtripFlights