Ill. Admin. Code tit. 89, § 338.100
a) The Administrator of the Administrative Hearings Unit may grant a request for a hearing only when:
b) The Administrator of the Administrative Hearings Unit may dismiss a request for an administrative hearing for the following reasons only:
3) the appeal has been abandoned. Abandonment shall be deemed to have occurred if the appellant, the appellant's authorized representative, or an individual legally authorized to act on behalf of the appellant fails to appear at the hearing, and the appellant does not have an adequate cause for failing to appear. Adequate cause for failing to appear at an administrative hearing may include, but is not limited to:
e) The Administrator of the Administrative Hearings Unit shall:
3) provide a written notice to the appellant at least 15 calendar days before the scheduled hearing, which shall contain the following information: