user_turns: <SILENCE> mexican food <SILENCE> cheap vietnamese <SILENCE> phone number 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 mexican R_location R_price chiquito_restaurant_bar serves mexican food I'm sorry but there is no restaurant serving cheap mexican food api_call vietnamese R_location cheap thanh_binh serves vietnamese food in the cheap price range thanh_binh is a great restaurant The phone number of thanh_binh is thanh_binh_phone  you are welcome