If your employees are out of the office this should be set as a time off on their profile.
This way your customers won't be able to book an appointment with them for that period.

To set time off for your employees, go to the 'Settings' menu and select 'Team' under the 'Accounts & Billing' tab:

Select the employee you want to add time off for and click on the plus sign in the 'Time Off' field. Alternatively, you can click the 'Time Off' icon in the top right corner:

Enter the details for the time off period, you can also toggle switches if this is an all-day
or a repeated event, and click 'Save':

The employee's time off periods will be displayed on their profile page:

To edit or delete a time off period, click on the three-dot menu in the 'Time Off' field: