Another thing you can do is something we do

I've had clients who want just keep you on the line for the smallest thing, even to talk about the weather. Try the "Is there anything else" method, then if after a few minutes they still don't get it, politely say something like

"(NAME) I appreciate teh conversation, but I really need to close this chat soon. Is there anything else I can assist you with?"

That usually gives them the hint.