If the subject is a sensitive one, be sure to use email. This way you keep a record of your letter and any response. Keep records of these emails by sending them to your own private email...
This is to inform you that I will not be able to attend office on two days (13/01/2012 - half day and 16/01/2012 -full day), as I will be out of station for festival.So, I kindly request you to...