user_turns: <SILENCE> i would like portuguese food the south <SILENCE> what is the address 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 ? There are restaurants serving portuguese food . What area do you want? api_call portuguese R_location R_price nandos is a nice place in the south of town serving tasty portuguese food Sure , nandos is on nandos_address  you are welcome