user_turns: <SILENCE> looking for a cheap restaurant serving portuguese food i dont care <SILENCE> whats the phone number what area is it in 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 ? What part of town do you have in mind? api_call portuguese R_location cheap nandos serves portuguese food in the cheap price range The phone number of nandos is nandos_phone Sure , nandos is on nandos_address  you are welcome