Any interested party may withdraw his or her appeal, petition for hearing or petition for review at any time prior to a decision thereon, in which case the previous determination, redetermination, denial, order and notice of assessment or decision shall be final in accordance with the provisions of the Employment Security Act. Such withdrawal shall, however, be subject to the approval of the office of administrative hearings in the case of an appeal or petition for hearing, or of the commissioner in the case of a petition for review.