Query: user: I need a round trip flight.
assistant: What do would you like it on? What city are you coming from?
user: I'm leaving from Philadelphia and coming back on the 7th.
assistant: Where are you going? What date are you going?
user: I'm leaving next Tuesday. I wanna go to NYC. I'm fine with any class.
assistant: There are 4 flights for you. Is American Airlines okay? One flight takes off at 3:20 pm with the returning flight at 1:35 pm. The tick would cost $162.
user: That's good. Thank you. That's all.

Intent: Flights:SearchRoundtripFlights