generate response: That will work. Please book 8 tickets. I'll also need a reference number.. Intent: book_train. Slots: train-arriveby=19:30, train-bookpeople=8, train-day=friday, train-departure=stansted airport, train-destination=cambridge, train-leaveat=18:15
Response: Booking was successful, the total fee is 80.8 GBP payable at the station . Reference number is : 2D2L9TYI .