generate response: Whichever train goes to stansted airport Tuesday from cabridge arriving closest to 21:30.. Intent: book_train. Slots: train-arriveby=21:30, train-bookpeople=5, train-day=tuesday, train-departure=cambridge, train-destination=stansted airport
Response: Booking was successful, the total fee is 50.5 GBP payable at the station. Reference number is : GMYBPE6F .