Voicemails need to maintain a professional consistency that’s aligned with the entity it’s representing. That said, the structure can vary depending on the situation. There’s no template set in stone. In fact, trite and generic should be off the table. The goal should be a balance of uniqueness and practicality.
Receptionist Group is an option which forwards incoming calls directly to certain users or phone numbers before call goes to Auto Attendant. This group has its own activity periods (weekly schedule). Navigate to HostPilot > Services > Unite > Auto Attendants > Add Receptionist Group. Specify the Receptionist Group Name, Display Name and Ring type. Set up the Receptionist Group Schedule type Set the time frame for the schedule to be active and save changes. Add users/phone numbers and save changes. Further destination of a call depends on the rest of the Auto Attendant options.

You should acknowledge that right off the bat by apologizing that they couldn't reach you directly.
Note: The primary phone number cannot be unassigned from the Auto Attendant. To release the main number, you need to swap it with another spare phone number on the account. Released numbers can be later assigned to a user, a Hunt Group, or any other object on the account. Toll-free numbers cannot be used as primary users' numbers.