Get creative. Poke good-natured fun, or tease them with your dry or self-deprecating humor. Remember that the goal is to make them feel happy to start the day, and not the other way around!
Wrap up with a call to action, an explicit call to action again speaking to their subconscious mind. So here's what you have to do next. Take a moment, leave me a message with your name, phone number twice, including your area code, the address of the property you're thinking of selling, your asking price. A lot of people don't like to include that because they don't want the seller fixating on a price. I like to know what's on their mind if they even have a starting point. You noticed, I don't say what you're asking, what, what you need to get for the property, because I'm probably not going to be able to offer them their asking price, but I'd like to know what, if anything, they have in mind.

Rehearse or write down your message before recording it. Remember that old saying “practice makes perfect?” It’s certainly true when it comes to creating an electronic greeting. The more you’ve rehearsed, the easier the message will be to restate. If you don’t have time to practice, writing down the greeting before recording it – and then reading it aloud from the paper – may help you stay focused on the correct wording.
“Hello, this is Morgan Freeman. I wish I could tell you that Morgan Freeman was available to take your call. I wish I could tell you that, but this is no fairytale world. Morgan Freeman is gone now; to where I cannot say. But if you’re lucky, I might just call ya’ back. Get busy leavin’ your message.”