Those all sound fine to me, Selvakumar.
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Dear sir/mam
I will drop my ___________ back home and come to the office for the meeting at the earliest.
I hope you will understand my situation and grant me leave for half day. I will come back to the office post lunch.
Thanking you,
Yours sincerely,
Dear Sir,
I would like to request leave for first half (April 15, 2017)
Thank you very much for your consideration of this matter.