Query: user: I need a round trip flight on United Airlines leaving the 10th of March returning the 14th of March.
assistant: What is the starting point?
user: San Fran.
assistant: Where are you flying to?
user: Chicago.
assistant: United Airlines has one for $254 leaving at 9:20 pm and the return flight at 1:50 pm.
user: Is it refundable? Are there zero stops?
assistant: You can get a refund but there is 1 stop.
user: That's perfect.
assistant: Would you like to purchase a ticket?
user: One Economy ticket please.

Intent: Flights:ReserveRoundtripFlights