generate response: Saturday from Peterborough to Cambridge for 3 people. I will need the reference number too please.. Intent: book_train. Slots: hotel-bookday=saturday, hotel-bookpeople=3, hotel-bookstay=4, hotel-internet=dontcare, hotel-name=alpha-milton guest house, hotel-parking=no, hotel-pricerange=moderate, hotel-stars=3, hotel-type=guesthouse, train-arriveby=12:45, train-bookpeople=3, train-day=saturday, train-departure=peterborough, train-destination=cambridge
Response: Right, Saturday, did you have a time you want to leave by? The trains leave every 30 minutes starting at 5:19