Proof that some people just Don’t Get It: in response to my out of office voicemail message directing callers to contact my co-worker for anything urgent, a woman left the following message on MY voicemail: “Co-worker, I am having this issue, blah, blah, blah. Please call me at X.” Yeah, I–not co-worker–got the message a week later when I returned.
These messages are generally formal in nature and have the information about the unavailability of an individual and also the details of the person who can be contacted in his/her absence.

I give my folks scripts because, otherwise, I end up with long winding OOOs that talk about why they’re out but not what the writer/caller should do to get help (staff is 1/3 entry-level with varying degrees of professional office familiarity). I do not have the time to micromanage to this level, though – if I see an off-spec OOO, I send the how-to guide and remind them that they need to tell people who to call while they’re out or to mention the specific dates, but most of them have good judgment enough not to be totally inappropriate to the point I need IT to intervene.
U.S. regular, full-time staff members may take three floating holidays during the calendar year. These floating holidays may be taken on days of your choosing, with your supervisor's approval.