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?
assistant: It leaves from McCarran International Airport.
user: Is there something else?
assistant: There's a Delta Airlines flight with a 4:45 PM departure and 1 stop for $339.
user: I like that one.
assistant: Would you like to purchase tickets?
user: Yes, I need four tickets please.
assistant: Confirming a flight on Delta Airlines from Las Vegas to Portland on March 4th, for 4 premium economy tickets.
user: Perfect. What's the arrival time of the onward flight?

Intent: Flights:ReserveOnewayFlight