Dear whom will concern:
I am a avid fan of xxx program which was broadcasted in entertainment channel of your TV station. I write this letter to express my appreaciate and take some my own advices to you.
your xxx program is rich in content of stories, games, english songs and other details which can improve my own english ability and let me know more foreign culture,all these above are advantages.In the other hand, the speech speed in your program is too fast to me to listen clearly and understand accurately.and it broadcasts only two times a week, I hope if you can consider the people need to learn english just like me.
If you can low down the speech speed and broadcast more often, I will be very grateful.
sinserely
yours.