user_turns: <SILENCE> restaurant in the center serving persian food thai food center <SILENCE> address address 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 ? I'm sorry but there is no restaurant serving persian food There are restaurants serving thai food . What area do you want? api_call thai R_location R_price bangkok_city is a nice place in the centre of town serving tasty thai food Could you please repeat that? Sure , bangkok_city is on bangkok_city_address The phone number of bangkok_city is bangkok_city_phone  you are welcome