Query: user: I'd like a one way flight on the 4th of this month to Portland, OR. I need a premium economy ticket.
assistant: Departing from where?
user: From Vegas please.
assistant: I have 4 possibilities for you. American Airlines has a 7:15 pm flight with a 1 stop for $331.
user: Where does that take off from?

Intent: Flights:SearchOnewayFlight