I'm out of office.

Meaning

I'm not available.

Examples

• John: Can you review this document today?
• Alice: I'm afraid I can't. <b>I'm out of office</b> until next week.
• John: Oh, okay. When will you be back?
• Alice: Next Monday. I will respond to your requests then. Remember, <b>I'm out of office</b> until then.