If you need more time to prepare, go to the hearing and ask for an adjournment. An adjournment means that your hearing will be rescheduled.
If you cannot go to the court date, file an affidavit of unavailability before. Write the reason you cannot be in court and attach proof. At the hearing, the judge will see the affidavit and may adjourn the case. The court will mail a notice of the new date.
If you miss the court date, file an order to show cause to get a new one.