Dear Prof.XXX:
Hello, I am Siming Song, an international applicant who has been admitted to your university.
It is really my pleasure to learn that I have been offered admission to XXX Program at XXX University. I consider it as my great honor that your department can give me the chance to study there. However, I'm very sorry that I have accepted the offer of admission from XXXX University at an earlier time. It’s really a hard decision for me for both of you universities are very good.
So I am sorry to say that I have to decline the offer of admission from XXX with deep regret.
I am very appreciate your precious time and effort in evaluating my application in this case. Department of XXX at XXX is widely recognized as one of the most diverse and active department in the world, so I am confident that your department will be very successful in recruiting new students.
I sincerely hope this will not cause too much inconvenience to you. Again, thanks a lot for your help and still want to express again my deep gratefulness to your offer and warm welcome.
Sincerely yours
XX
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