quitclaim

verb [vt. 及物动词]放弃权利；宣布免除（某人的）责任或债务

If you don't attend class trial because of your own problem, we will regard it as a quitclaim. Students who transfer in don't have an class trial.
学员因自身原因没有参加试听将视为自动放弃试听权利。插班的学员没有试听期。