Dear Professor xxx:

I am most excited to have been informed of CMU's decision to accept me into the MSCF program a couple of days ago. It is great news and I have decided to accept the offer. From now on, I will be looking forward to joining your department and starting the wonder program.

I believe that my application would not have been so successful without your kind help. Your insightful and sincere introductions about your program during my campus visit last October were truly helpful and your kindness of spending some time talking to me reinforced my decision to apply for your distinguished program. I would like to extend to you all my sincere gratitude for your useful guidance and help. I feel so proud and delighted to become a member of your program. 

I will go through all the necessary procedures of visa application as soon as possible and make necessary preparations for starting the program in the coming fall. Once I am on the campus, the first thing I will do is to pay you a visit so that I can thank you in person. It would simply be wonderful to come to CMU.

Sincerely,

Wang XXX