user_turns: <SILENCE> vietnamese in the center part of town correct yes <SILENCE> may i have the address and price range please and the 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 ? There are restaurants in the centre of town . What type of food do you want? You are looking for a vietnamese restaurant right? api_call vietnamese R_location R_price thanh_binh serves vietnamese food Sure , thanh_binh is on thanh_binh_address thanh_binh is in the cheap price range  you are welcome