Notice against change of shift duty without any prior permission

One of our employee change his shift duty without any prior permission or intimation to his hod or hr department, what types of notices to be issued him. Please send if any ready draft available for reference.

Dear Prijith,
First of all, why you are accepting any change of shift without any intimation to HOD or HR. This should be treated as late coming or early going as per the shift scheduled assigned to the associate. You can deduct salary as per late coming / Early going and after deduction you may also issue warning letter for late coming / early going. But the only necessity will be HOD to relive the associate as per the schedule shift time.