Query: user: I need a round trip flight.
assistant: When are you leaving? Where are you going? Where are you leaving from?
user: I am leaving from San Francisco going to Las Vegas on the 4th of this month.
assistant: When are you coming back?
user: On the 14th of March.
assistant: I found 4 options including an American Airlines flight leaving at 5:30 pm. The return flight departs at 5:30 am. The ticket cost is $107.
user: Perfect, please buy the tickets now.

Intent: Flights:ReserveRoundtripFlights