user_turns: <SILENCE> what about vietnamese vietnamese food yes <SILENCE> whats 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 ? I'm sorry but there is no restaurant serving crossover food Did you say you are looking for a restaurant in the west of town? api_call vietnamese R_location R_price thanh_binh is a nice place in the west of town serving tasty vietnamese food The phone number of thanh_binh is thanh_binh_phone  you are welcome