To configure your IVR (Interactive Voice Response) options with a brand-new audio file greeting at any time. You can record and select greetings to play on specific holidays in advance. Let callers know that your office is closed for a holiday. (See this article to set up a holiday schedule for your Auto Attendant.) Promote special sales and offers for callers to hear on selected dates, before the caller selects a menu option. Prepare special IVR instructions for callers on specific dates, when you anticipate a high call volume.
Let’s say you’re a restaurant owner and you want to greet all your suppliers by name when they reach your voicemail. Your suppliers are saved in your phone’s Contact list, so you could write a greeting like: Hi {FirstName} from {Company}, I’m out of the office this week, but please leave me a detailed message and I will return your call as soon as I am back next week.

Consider adding 'You can also email your query to us at [insert email address here]. These queries will be answered within [insert time frame].' Again, if you intend to make a promise to your customer in a voicemail, ensure you keep it.
Website: https://www.macrynvoicegreetings.com/voicemail-greetings-business-phones-cell-phones/