user_turns: <SILENCE> vietnamese food <SILENCE> center center turkish food <SILENCE> address price range 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 . You are looking for a restaurant is that right? Sorry there is no vietnamese restaurant in the centre of town api_call turkish R_location R_price efes_restaurant is a nice restaurant in the centre of town serving turkish food Sure , efes_restaurant is on efes_restaurant_address efes_restaurant is in the moderate price range  you are welcome