generate response: I would like to book Zizzi Cambridge for 6 people on Sunday at 16:15.. Intent: book_restaurant. Slots: restaurant-area=centre, restaurant-bookday=sunday, restaurant-bookpeople=6, restaurant-booktime=16:15, restaurant-food=italian, restaurant-name=zizzi cambridge, restaurant-pricerange=cheap
Response: I'm terribly sorry but Zizzi is booked at that time. Can I try at another time or on another day?