Query: user: I feel like travelling soon, can you help me get a one way ticket?
assistant: Where are you leaving from and where and when do you plan to leave?
user: I'll leave from Vancouver, BC travelling to Washington on the 7th of March
assistant: Do you prefer any airline? Maybe Alaska Airlines or United Airlines perhaps?
user: I prefer delta airlines, either business or economy is fine. I need four tickets
assistant: Please confirm that you need 4 economy tickets for next Thursday via Delta Airlines from Vancouver to Washington?
user: Actually I prefer American Airlines, and to leave from Vegas
assistant: OK so a flight from Las Vegas via American Airlines?
user: Yes, how much is that?

Intent: Flights:ReserveOnewayFlight