The general sessions judge may, at the request of either party, and on good reason being assigned, postpone the trial to any time not exceeding fifteen (15) days. The postponement shall not be for a longer period of time unless agreed upon by the parties, no civil court is being conducted, or upon request of the plaintiff, the party making the application for postponement paying the costs. As used in this section, “civil court” includes diversionary courts created for special civil proceedings.