If you sound too relaxed or overly familiar, you're going to undermine both your and your company's credibility. People want to buy from an expert — not someone trying too hard to sound cool. So avoid coming off as too laid back and using too much slang, "um's," and "yeah's."
At the beginning of the show, I used an example of a voicemail greeting – I used the name Luke Skywalker. He is a character from the Star Wars movie for those of you who hadn’t heard of Luke Skywalker before.

To leave the perfect voicemail message, start by identifying yourself so the recipient knows who you are right off the bat. Then, if the person doesn't already know, mention how you got …
I had to call Elijah this week to get some information. I tried his technique on him, cutting off my message in midword. I said, “I’m going to quote you in my column this week and I need…” He called me back in under 3 minutes laughing hysterically. This technique could revolutionize message leaving. I’ve been using it all week and it works. Be careful about how far you go on the humor with someone you don’t know.