Be aware of your tone. Keep it clean and simple. Sullivan says: “Even if you work in a casual office environment, the people emailing you may not. It's fine to have a light tone in your communications, especially when you're in an email conversation with someone directly, but your OOO is more of a blast message—including a cat meme or silly quote could backfire if your OOO goes to, say, a new client prospect or the sales director at a company you've been trying to engage.”
A clear, thoughtful out of office message saves the caller from troubles and inconvenience caused by your unavailability as they know what they should do next. Such a system avoids the negative impact that could come from the inability to respond to calls and messages. Your clients would likely try and contact you again and again, getting frustrated and losing trust in your business.

2. Here’s your [holiday name] to do list. Holidays are a busy period, both for marketers and consumers alike. Most of us are turn back to the good ol’ pen and paper to put together all kinds of to-do lists.
"[Auto-attendants] assist a business of any size in presenting a more organized, efficient, and, if necessary, more robust picture of itself,” points out Brandi Armstrong, Co-Founder of Telecentrex and blogger on evancarmichael.com. The right greeting can make the difference between a frustrated customer or a satisfied one.