Dear Mr. Steve Carter,
Congratulations on the 60th graduation ceremony of Yuoralis High School. As a former student, I am extremely proud that the school has become one of the best schools in the local community. I felt honored when I received your kind invitation to deliver a speech at the ceremony. However, I am deeply sorry to say that I will not be able to give a speech because I have a very important overseas business trip scheduled during that time. I would have loved to speak to the graduating students, but I must decline your invitation to this meaningful celebration. I wish you a memorable graduation ceremony.
Sincerely,
Jane Whittmore