user_turns: <SILENCE> polish food expensive restaurant <SILENCE> north_american food <SILENCE> what is the phone number and post code thank you good bye
system_turns: Hello , welcome to the Cambridge restaurant system . You can ask for restaurants by area , price range or food type . How may I help you ? I am sorry but there is no polish restaurant that matches your request api_call polish R_location expensive Sorry there is no polish restaurant in the expensive price range api_call north_american R_location expensive gourmet_burger_kitchen is a great restaurant serving north_american food and it is in the expensive price range The phone number of gourmet_burger_kitchen is gourmet_burger_kitchen_phone  you are welcome