generate response: How about 16:45 on Tuesday? Can I have the reference number?. Intent: find_taxi. Slots: restaurant-area=north, restaurant-bookday=tuesday, restaurant-bookpeople=5, restaurant-booktime=16:45, restaurant-food=italian, restaurant-name=da vinci pizzeria, restaurant-pricerange=cheap
Response: I'm sorry, that time is not available either. Would you like to try another one?