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.
Website: https://blog.zencare.co/what-to-expect-on-an-initial-call-with-a-therapist/

Your voicemail is set up with a default greeting, but you can record a personal greeting any time you want.
4. Vacation Day Voicemail Greeting. If your business is off for a holiday, it's a common courtesy to update your voicemail to acknowledge the closure. Mention the closure in the beginning of the message, convey when your business is reopening, and don't forget to wish the callers a happy holiday if the occasion calls for it.