Query: user: I want to search for some one-way flights.
assistant: Where to?
user: I'm going to London, UK.
assistant: When and from where will you be departing?
user: From Atlanta, GA, on this Saturday.
assistant: I've found 4 options- there is an American Airlines flight leaving at 8:40 pm, with 0 stops, for a cost of $228.
user: I like the sound of that.
assistant: Shall I buy tickets now?
user: No, not yet.
assistant: Anything else I can help you with?
user: Please search for round trip flights.
assistant: When are you coming back?
user: On the 4th of this month.
assistant: I found 1 convenient flight- an American Airlines flight that leaves at 8:40 pm, with a return flight at 0:10 am, at a cost of $341.
user: Which airport does it fly to?
assistant: It flies to Heathrow International Airport.
user: That sounds good, can you help me buy tickets?
assistant: So I'll buy 1 Economy ticket for the American Airlines round trip flight from Atlanta to London, departing tomorrow at 8:40 pm, and returning next Monday at 0:10 am. Is this okay?
user: Yes it is. But is the ticket refundable? Where does it depart from?

Intent: Flights:ReserveRoundtripFlights