Please check my composition in English about lost file in a bus Thank you everybody for your help

Task 1: Write a letter to a bus company saying you have left something valuable on the bus and tell them what to do if they find it.
Dear Sir or Madam,
The reason why I am writing you this letter is that i left my yellow file with black straps in one of the buses belonging to your company. Two days ago, on the fifteen February 2011, at 4 p.m approximately I took a bus at the Kiev Station . After I went off at the bus stop near the State University I found out that I had left a personnel file with the documents on my property and my indentified card. First I decided to inform about my lost file on the phone. I have looked up your telephone numbers in the Yellow pages. Unfortunately, all my attempts to get through to your office failed.
Unfortunately, I am not sure about the bus number but I remember It was white with red strips. Fortunately, I paid attention to the name of the Driver which was written on the interior glass of the bus. If I remember rightly his name was Bill Getes.
As I mention the bag is yellow with black leather straps moreover there is a big black text with my initials B.P
If the avove description matches any file brought to your lost property office please contact me on my phone 1111111111 or email me Email Removed and I will arrange to pick it up at your office.
Many thanks for cooperation,
Yours faithfully,
Bred Pitt