generate response: Is it available at 15:00?. Intent: book_restaurant. Slots: restaurant-area=east, restaurant-bookday=friday, restaurant-bookpeople=4, restaurant-booktime=15:00, restaurant-food=gastropub, restaurant-name=royal standard, restaurant-pricerange=expensive
Response: Yes, booking for 4 on Friday at 15:00 was successful. Would you like the reference number for that.