Query: user: I will be leaving for a brief trip. Help me purchase flight tickets?
assistant: Is there any airlines you particularly prefer? How about Alaska Airlines, United Airlines or any other? Also, when would you like to board the return flight?
user: I am looking for United Airlines. I am planning to leave at half past 8 in the night on the returning flight.
assistant: What place are you leaving from and when do you plan to come back?
user: I am going from SF and coming back on the 7th.

Intent: Flights:ReserveRoundtripFlights