Query: user: I want to have 4 tickets for a round trip flight, which has the returning flight on March 9th.
assistant: Can you tell me the city from where you will be leaving?
user: I will be starting my journey from Berlin.
assistant: Which is your destination, and at what date do you want to have your trip?
user: I want to arrive to LA, and will be leaving for my trip on March 4th.

Intent: Flights:SearchRoundtripFlights