generate response: It doesn't matter when I arrive, but I would like to book for 8 people.. Intent: book_train. Slots: train-arriveby=dontcare, train-bookpeople=8, train-day=friday, train-departure=london kings cross, train-destination=cambridge, train-leaveat=15:15
Response: Okay great, your booking was successful and your reference number is : 6KJK9QY1 .