How Should I Draft a Warning Letter for an Employee with Frequent Unapproved Absences?

One of my employees is absent without authorization, though not on a continuous basis. He has been absent for 8 or 9 days each month. Despite receiving an oral warning previously, he has been absent again for three days without providing any formal information to management. Therefore, I am planning to issue a warning letter to him. Could you please advise on the appropriate format for this letter?

Thank you.

Please find the attached file. It may be useful to you.

Thank you.

Depending upon the misconduct, you can give a show-cause notice and an explanation, and issue a warning letter. Alternatively, you can issue an advisory and a warning letter. A template is attached herewith for your reference and records.

Regards,
Alphonse