Query: user: I need help booking a flight. I want to leave Portland at around 8 pm.
assistant: What is your destination? What time do you want to return?
user: I'm going to LA. On my return trip, I want to leave at around a quarter past 9 in the morning.
assistant: Any preferred airlines?
user: I prefer to fly on Delta Airlines.

Intent: Flights:ReserveRoundtripFlights