Query: user: I need one-way flights.
assistant: Where and when are you leaving from?
user: I plan to leave March 13th from Toronto.
assistant: Where are you visiting?
user: I prefer to use Delta Airlines traveling to Phoenix.
assistant: I have 1 flight from Delta Airlines leaving 2:10 am with 1 stop at the cost of $292.
user: Will the ticket be refundable?
assistant: No, the ticket isn't refundable.
user: The flight sounds nice to me.
assistant: Would you like to buy tickets for it?
user: Yes, I'd like to book a ticket.

Intent: Flights:ReserveOnewayFlight