Query: user: I would like to book a round trip flight.
assistant: What city are you departing from and when are you leaving?
user: I would like to leave on March 6th from Berlin.
assistant: On what day are you returning?
user: I will need four tickets and plan on returning on March 9th.
assistant: Where are you traveling to?
user: I need one ticket to travel to Phoenix, AZ.
assistant: Delta Airlines leaves at 3:50 pm and the return fight leaves at 6:15 pm for $557
user: Is there another option?
assistant: United Airlines leaves t 4:05 am and the return flight leaves at 1:25 pm for $547.
user: When does the flight reach destination?

Intent: Flights:SearchRoundtripFlights