Formal letter

Dear Mr. Cooper:

                              Do you remember the boy that bought you a time machine? Well, I am that boy.

           The machine was working very well and I could go to different places in different times, but now I have some problem. I can not change the dials that indicates the time that I want to go. Last time, I went to the past I could only stay for ten hours and I did not have a lot of time to did the things that I wanted because the time dial was broken.

          I need to know if you have any contact with Professor Flybender. If you have it, can you send me the information of how I could find him. Please answer me soon.