user_turns: <SILENCE> vietnamese food <SILENCE> phone number and area whats the phone number what area is it in 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 ? api_call vietnamese R_location R_price thanh_binh serves vietnamese food thanh_binh is a great restaurant The phone number of thanh_binh is thanh_binh_phone thanh_binh is a nice place in the west of town  you are welcome