generate response: Will you please book a table for 4 people at 16:15 on wednesday?. Intent: book_restaurant. Slots: restaurant-area=south, restaurant-bookday=wednesday, restaurant-bookpeople=4, restaurant-booktime=16:15, restaurant-food=indian, restaurant-name=taj tandoori
Response: Unfortunately, the time and day you've chosen is unavailable. Would you like to book a different time or day?