user_turns: <SILENCE> <SILENCE> <SILENCE> cheap <SILENCE> <SILENCE> <SILENCE> <SILENCE> thank you bye thank you bye thank you 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 ? What part of town do you have in mind? Did you say you are looking for a restaurant in the west of town? What kind of food would you like? api_call R_cuisine R_location cheap la_margherita is a nice place in the west of town and the prices are cheap thanh_binh is a nice place in the west of town and the prices are cheap The phone number of thanh_binh is thanh_binh_phone thanh_binh is a great restaurant Sorry but there is no other restaurant in the cheap price range and the west of town  you are welcome