Query: user: Search flight for four people to SF.
assistant: What is the departure city? when is the departure and the arrival back?
user: I would like economy tickets to Ciudad De mexico for 3rd of this month and back on March 12th
assistant: There is a American Airlines flight which leaves at 2:55 pm and the return flight is at 1:20 pm, costing $156
user: Is there any other option
assistant: There is an United Airlines flight which leaves at 8:45 pm and the return flight is at 9:15 am, costing $235
user: ok, thats good
assistant: should i buy the tickets?
user: No, please find me oneway tickets

Intent: Flights:SearchOnewayFlight