Dear Professor McGonagall,
I am unable to go to your school because I am currently on the other side of the galaxy battling Thread with my dragon Smar'larth. With no interstellar ships available, and with too few dragon riders as is, I will not be able to attend any school, or go to any other planet. Pern is my home now, and at the moment it is a rather harsh one.
If I am able to teach Smar'larth how to go Between all the way to Earth, then I might attend your school after this Pass is over. According to our astronomers, that will be in about forty more years. So at the moment I must respectfully decline your offer of attendance at Hogwarts School of Witchcraft and Wizardry.
Sincerely,
Ha'y Smar'larth's Rider