user_turns: <SILENCE> west part of town serving barbecue food <SILENCE> how about vietnamese <SILENCE> how about vietnamese food what is the phone number 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 R_cuisine west R_price Sorry there is no barbeque restaurant in the west of town api_call vietnamese west R_price saint_johns_chop_house is a nice restaurant in the west of town serving british food thanh_binh is a nice restaurant in the west of town serving vietnamese food The phone number of thanh_binh is thanh_binh_phone  you are welcome