Query: user: find one way flights
assistant: where to then?
user: this sunday to toronto
assistant: where will you be going from?
user: just san francisco
assistant: alaska airlines 4 flights 4:30 am 1 stop $258
user: is it refundable?
assistant: no it is not
user: what airport then?
assistant: sfo international airport toronto pearson international airport
user: three people economy

Intent: Flights:SearchOnewayFlight