generate response: I need a train for 1 from Cambridge leaving after 16:00 heading to London Kings Cross. Can you find any trains for that time and send me a reference number?. Intent: book_train. Slots: train-bookpeople=1, train-departure=cambridge, train-destination=london kings cross, train-leaveat=16:00
Response: Is there a specific day that you want to travel? What time do you want to arrive by?