generate response: ok book it for 6 on sunday at 15:30 and I need a reference # too. Intent: find_taxi. Slots: restaurant-area=centre, restaurant-bookday=sunday, restaurant-bookpeople=6, restaurant-booktime=15:30, restaurant-name=nandos city centre
Response: You're all set. The restaurant can only hold your table for 15 minutes after the reservation time. Your Reference number is : JAAA0FJ8 .