25. A notice of proof and hearing shall be sent to the parties within a reasonable time before the hearing and specify(1) the subject, date, time and place of the hearing;
(2) the right of the parties to be assisted or represented; and
(3) the authority of the commissioner to proceed, without further notice or delay, notwithstanding the failure of a party to be present at the scheduled time and place if the party has not provided a valid excuse for the absence.