Phrases Making Plans and Invitations

I'm booked up.

Meaning

Stating that one is unavailable.

Translation language

John: Are you free for lunch on Friday?
Alice: Unfortunately, <b>I'm booked up</b> on Friday.
John: How about next week then?
Alice: Let me check my schedule. Yes, next week is better; I'm not <b>booked up</b> then.