Marriage leave request

I am getting married on Jan. Wanted to request my manager for the leave request, as my fiance stays out of india
so I require 3 weeks leave to spend sometime with him as after my marriage I am continuing my job and we will be in
different company for couple of months..

Can u please help me out to draft a mail in such a mail that convince him to approve the leave request.

Explain it to your manager face-to-face. He/she may have questions. If it requires a written request ask what information should be included and provide it then.