generate response: No, actually I'll need tickets for two people please. Oh, and can you provide the reference number when you've got it please?. Intent: book_train. Slots: train-arriveby=dontcare, train-bookpeople=2, train-day=tuesday, train-departure=birmingham new street, train-destination=cambridge, train-leaveat=11:15
Response: Your request has been completed. The reference number is TTH2AA7N .