When you're not in the office, it's best to leave a note for your employees informing them of your absence. While it's always best to include your reason for being out-of-office, you should avoid including personal details. In some cases, an out-of-office message will be more informal. You can include a brief explanation of your absence and explain that you're not available for a while.

See also - https://www.easyfie.com/read-blog/870089_how-do-i-put-a-out-of-office-message-on-vacation.html