In: Computer Science
<Place>, <date>. To The Principal, <Institution name>, <place of institution>. Respected Sir, sub: re: leave approval for 1 day. I'm <name> pursuing <Std> with the no <reg no> requesting you to permit me leave for one day, as I've to work as a tourist guide on a part-time basis, due to the heavy work for me for the earnings. Thanking you, yours faithfully, <name>.