You have lost your friends book in the park. Write a

Dear Mark,

I am so sorry for losing your book while hanging out in the local park. Let me explain what happened during that night. To start out, I would like to mention that I was walking with my dog Roberto while attempting to read a borrowed book. Suddenly, Roberto went crazy and started running, which is why I had to follow him. I completely forgot to get the book back from the place where I left it and I sincerely apologize for that. To fix the problem, I plan on buying a new book for you. Hopefully, it helps.

Sorry,
Bob