You can easily set this up by combining Standard availability (workhours) and Date override availability. Here's how to do it:
Navigate to
AI Scheduler → Availability page Select a user from the top AI Scheduler filter
(available for users with Super Admin and Sales Manager permissions)
Select a user and set availability for one week on standard availability on the left
Save changes and click on the "Add Date Override" button and set availability for every other week
Learn all about Availability here.