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This script comes from Donato Diorio and it's quite simple and to the point. But it still does a great job of highlighting prospect benefits and the follow-up plan.

Users often don’t invest enough time into their messages, resulting in incomplete, unprofessional, or otherwise under-whelming greetings. Sure, crafting a greeting doesn’t sound all that complicated; however, there are a number of pitfalls users can fall into—i.e. informality, terseness, sincerity, lack of direction, and more. While none of these sound too catastrophic, they are often interrelated. As such, they tend to worsen any problem. For example, humor can cause informality, worsen ambiguity, and weaken sincerity. That being said, users should strive to avoid ALL these pitfalls.
If you like to keep things simple, opt for a basic greeting. Most voicemail options allow you to record just your name, which lets callers know they’ve reached the right person.