generate response: can you book it for 3 and give me the reference number please ?. Intent: book_train. Slots: train-bookpeople=3, train-day=saturday, train-departure=kings lynn, train-destination=cambridge, train-leaveat=17:00
Response: Booking was successful, the total fee is 23.52 GBP payable at the station. Reference number is : 7FJ6TZUM .