hi!
Well in the states there is no such thing as just a dean of Affairs. Now would it be one of the following:
A Dean of Students is usually the main person on any campus, whose responsibilities lie in residence life, housing, and judicial affairs. A Dean of Student Affairs, is a person in charge of student life, mainly the student center, student activities on campus and sometimes the recreation center.
If you have leadership expertise or experience in any of these areas of the campus, then you probably would be a good assistant. Deans are usually fairly busy people. The assistant needs to be thorough, responsible and know just as much as the Dean and be able to keep track of what goes on around the campus.
Hope this helps! Keep me updated:)