user_turns: <SILENCE> id like a restaurant in the south part of town that serves world food <SILENCE> how about portuguese <SILENCE> what is the phone number and address what is the address 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 ? What kind of food would you like? api_call world south R_price Sorry there is no world restaurant in the south of town api_call portuguese R_location R_price nandos is a nice restaurant in the south of town serving portuguese food The phone number of nandos is nandos_phone Sure , nandos is on nandos_address  you are welcome