Query: user: i am looking for Economy class flights?
assistant: Where do you plan to visit?
user: I am traveling to Portland.
assistant: When do you plan to return and leave?
user: I am leaving on the 7th and returning of 10th of this month.
assistant: From where are you leaving?
user: i am leaving from Vancouver, BC and would prefer United Airlines.
assistant: United Airlines flight is available and leaves at 6:05 pm. The return flight leaves at 10:35 am and which costs $233
user: When will my return flight arrives?
assistant: It arrives at 8:12 pm
user: that's great for me. I am planning to go for a short trio. Can you please help me to book the flight tickets for four people in my group?
assistant: Please confirm the booking details: The flight is from Vancouver to Portland. The airlines is United Airlines which departing on next Thursday and the return date is March 10th. The onward flight leaves at 6:05 pm and the return flight leaves at 10:35 am. The seating class is Economy which is for 4 passengers.
user: yes. That's great. From where the flight is departing? Is the ticket refundable?

Intent: Flights:ReserveRoundtripFlights