31. Hi, this is [your name] at [your company]. If you are calling for [include reason] please visit our [website, social media handle, etc.], contact [name and title of colleague and phone number] or send me an email at [insert email address]. For other inquiries, leave a brief message and your name and number and I will call you back by [timeframe].
18. “Thanks for calling [Company name/your name]. We hope you’re enjoying the holiday season. We aren’t available at the moment due to our holiday hours. Leave your name, number and the reason for your call and we’ll get back to you ASAP! Thanks for calling.” Everyone deserves a break. Let your callers know although you might be enjoying one too, that their needs are important.

You should acknowledge that right off the bat by apologizing that they couldn't reach you directly.
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.