Query: user: Can you find me one-way flights?
assistant: When do you plan to leave? Where will you be leaving from?
user: I am leaving from Los Angeles on the 11th.
assistant: Where are you planning to visit?
user: I am travelling to Portland
assistant: Sure. I found 5 flights. Alaska Airlines, outbound flight leaves at 7:25 am has 0 stops and the ticket price is $133
user: Which airport does the flight depart from ?
assistant: The flight departs from LAX International Airport
user: Which airport does the flight arrive?
assistant: The destination is PDX International Airport
user: Good. Can you search round trip flights with refundable tickets? My plans might change.
assistant: When are you coming back?
user: I want to be back on the 13th.
assistant: There is Alaska Airlines, outbound flight leaves at 7:25 am. The return flight leaves at 1:55 pm. The price of ticket is $181.
user: Which airport does the flight arrive? Which airport does the flight depart from?
assistant: The destination is PDX International Airport and the departure from LAX International Airport.
user: Sound Good. Can you help me to buy tickets for 2 people?

Intent: Flights:ReserveRoundtripFlights