In which Zin plays detective...
Zin: Welcome to (company), you're speaking to Zinnith!
Customer: Mr X, please.
Zin: (searches the list) I'm sorry, I don't seem to have anyone by that name in my list. Is he supposed to be working here at (company)?
Customer: Duh, of course he is! Don't you know anything?
Zin: You have reached the switchboard, sir. It's possible he's working here and I just haven't gotten the information. I can find out for you if you just hold on a moment.
Customer: He's been there forever! Nevermind, I'll take care of it on my own, you clearly can't help me. *click*
Oh yay, what a fun customer to speak to first thing in the morning. However, being the dutiful telephone muppet I am, I call up our client to try to solve the mystery.
Zin: Hi, this is Zinnith at the switchboard. I just had a customer asking for Mr X, do you know who that is?
Client: Mr X? He quit a year ago!
Mystery solved, another customer put in the category 'needs a reality check and a class in how to behave when you speak on the phone'.