Write a letter to the librarian requesting her to issue you duplicate card as you have lost the original one.
The Librarian
St. Joseph Convent School
Shandara
New Delhi
12th April 201_
Subject: Regarding the issue of duplicate identity card
Respected Mam
I regret to inform you that my original identity; card has been lost. I study in grade VA (Rohit Sharma). Because of missing of the identity card, I am facing several inconveniences. I am unable to get permission into the library. reading room and the journal section. I am also deprived of the traveling concession for the same reason. Therefore, I request you to issue a duplicate identity card. I herewith furnish a copy of my, passport size photograph.
Thanking you
Yours obediently
Raunak