generate response: book for 2 people and get me the reference number. Intent: book_train. Slots: train-arriveby=13:00, train-bookpeople=2, train-day=friday, train-departure=ely, train-destination=cambridge
Response: Booking was successful, the total fee is 8.8 GBP payable at the station . Reference number is : 8BUQLIK8 .