user_turns: <SILENCE> how about chinese food how about chinese food <SILENCE> whats the phone number 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 api_call chinese north R_price saigon_city is a nice place in the north of town The phone number of saigon_city is saigon_city_phone  you are welcome