Room Service . May I help you ?   This is Room 603 . I'm afraid that the heating system doesn't work . It's very cold here .   Have you switched on the radiator ?   Yes . I have switched it on for a long time . The room is still very cold .   We're terribly sorry for that . We'll send our staff io fix it now . Or do you want to change your room ?   I prefer not to move first . 