If a student notified to appear before University administration, staff, or the discipline committee fails to comply, and staff or the chairperson of the discipline committee, as the case may be, reasonably believes the failure to be inexcusable; the staff member or discipline committee will make a decision on the basis of information which is available, and shall impose the sanction considered appropriate. When it appears necessary to avoid undue hardship or to avoid injustice, the dean of students may extend the time to enable a student to respond to an accusation or prepare a defense.