Query: user: I have an upcoming trip that I would like a one way flight for. I'd like to leave on the 11th.
assistant: What is your destination?
user: I'm going to London, England.
assistant: Where are you departing from?
user: I'm leaving from Phoenix, and my party has two people.
assistant: I've found 2 flights for you. There is a American Airlines flight which departs at 7:35 am and has 1 stop. The ticket costs $321.
user: Are there other options?
assistant: There is a Southwest Airlines flight which departs at 7:05 am and has 1 stop. The ticket costs $320.
user: When does the flight arrive, and which airport does it deart from?
assistant: The flight departs from Sky Harbor International Airport and arrives at 6:04 am.
user: Sounds good. I'd like to travel soon. Can you help me book a ticket, in either business or economy class?
assistant: Please confirm these details: you would like 2 tickets going from Phoenix to London with Southwest Airlines. The departure date is March 11th and the seating class is Economy.
user: No, actually, I'd prefer Premium Economy.

Intent: Flights:ReserveOnewayFlight