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.
OK. Is it convenient for us to come now?
Yes, please.