Query: user: I have a very important business conference coming up and need to find a round trip plane ticket going from NY to SFO and would prefer to fly with United Airlines if at all possible.
assistant: I should be able to easily help you with that but first can you tell me the dates you would like to depart and return?
user: I have to leave no later than the 4th and would like to return home on March 14th.

Intent: Flights:SearchRoundtripFlights