user_turns: <SILENCE> lets see im looking for a restaurant in the north part of town that serves vietnamese food vietnamese breath how bout north part of town <SILENCE> breath whats the phone number of the venue k you goodbye thank you bye thank you goodbye
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 ? What kind of food would you like? I'm sorry but there is no vietnamese restaurant in the north 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 I am sorry but there is no other vietnamese restaurant in the west of town thanh_binh is a nice place in the west of town serving tasty vietnamese food You are looking for a vietnamese restaurant right?  you are welcome