Thank you very much for your interest in my profile. This year, a historically large number of admissions and interview invitations have been received. Your program is highly impressive. However, I regret to inform you that my attendance to your interview cannot be entertained for this instance due to a large pool of admission offers.
Please note that this is not the final decision. For the appealing process, please contact my assistant, Ms. XXX at XXX@XXX.com during the daytime.
May I take this opportunity again to thank you for your genuine interest in me and wish you every success in the future.