generate response: How about two nights?. Intent: book_hotel. Slots: hotel-area=west, hotel-bookday=sunday, hotel-bookpeople=5, hotel-bookstay=2, hotel-name=cambridge belfry, hotel-pricerange=dontcare, hotel-stars=4, hotel-type=hotel
Response: Booking was successful. Reference number is : VHKR1UH7 .