generate response: Saturday at 15:15.. Intent: book_train. Slots: restaurant-area=west, restaurant-bookday=saturday, restaurant-booktime=15:15, restaurant-food=italian, restaurant-name=la margherita, train-arriveby=11:30, train-bookpeople=1, train-day=saturday, train-departure=stevenage, train-destination=cambridge
Response: I was unable to book a reservation at La Margherita for Saturday at 15:15. Is there another day or time that you would like?