Query: user: I need to find a round-trip flight.
assistant: Where are you leaving from, and what is your departure date?
user: I want to leave LA on the 8th of this month.
assistant: What is your destination? When do you want to return?
user: I want to go to Portland, and return on March 10th.
assistant: There is an Alaska Airlines flight for $141 that leaves at 5:15 am. The return flight leaves at 10:10 am.
user: Are there any other flights?
assistant: There is an American Airlines flight for $178 that leaves at 11:15 pm. The return flight leaves at 6 am.
user: Which airport does it arrive at, and what time?
assistant: The flight arrives at PDX International Airport at 1:45 am.
user: Are there any other flights? I prefer flying Economy class with Delta Airlines.
assistant: There is a Delta Airlines flight for $177 that leaves at 9:50 pm. The return flight leaves at 5:40 am.
user: That one sounds good. I'd like to buy 2 tickets.

Intent: Flights:ReserveRoundtripFlights