generate response: Are there tickets available for four people?. Intent: book_train. Slots: train-arriveby=13:45, train-bookpeople=4, train-day=saturday, train-departure=bishops stortford, train-destination=cambridge
Response: There are! I've booked 4 tickets for you. The total fee is 32.32 GBP payable at the station. Your reference number is : 5CJVK4K8 . Is there anything else?