write a letter the heat off the company that you are working in

Dear Madam
I am a student and I am writing to inform you about I have borrowed some books. I had to give back these books in a week. But we dicided suddenly to go to an another city because my granny was ill. Unfurtunately, I could not come back the books in time.
I hope which you will be sure to me. Certainly I will return them. Please you will only give time in 2 days for returing to you. Because, now My granny is being good day by day and we may go home yerterday.
Please sorry me for I could not return the book in time.
Yours faithfully
Jon Smith