Query: user: Hello! Please can you check if round-trip is available in United Airlines for I've to leave on March 5th and my return will be on the 10th.
assistant: Sure. Where is your travel from and to?
user: I'll be travelling from Toronto to Philadelphia.
assistant: Okay! please give me a moment....Yup, there is a United Airlines flight available with a round-trip. The outbound flight will take off at 5:35 pm and the return flight will take off at 11:30 am. The cost of the travel will be $235.
user: Which is the departure airport?
assistant: The departure airport will be Toronto Pearson International Airport.
user: Is it a refundable or non-refundable ticket?
assistant: Sorry, that the ticket is non-refundable.
user: Sounds good to me.

Intent: Flights:SearchRoundtripFlights