user_turns: <SILENCE> polish food north_american food type expensive restaurant expensive restaurant no 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 polish food Did you say you are looking for a restaurant in the north of town? I'm sorry but there is no north_american restaurant in the north of town You are looking for a north_american restaurant right? Did you say you are looking for a restaurant in the north of town? I'm sorry but there is no north_american restaurant in the north of town  you are welcome