Query: user: Could you find me a one way flight leaving from Vancouver? I need four Economy tickets.
assistant: When are you wanting to leave?
user: I'd like to leave on the 9th.
assistant: Where are you leaving from?
user: I'd like to leave from Seattle.
assistant: There's an Alaska Airlines flight that leaves at 12 pm and has 1 stop. It costs $222.
user: When will the onward flight be arriving? Where is it leaving from?
assistant: The flight will be leaving from Seattle-Tacoma International Airport. The onward flight will arrive at 8:12 pm.
user: Are there any other options? I prefer Southwest Airlines.

Intent: Flights:SearchOnewayFlight