You will need to file a motion to enforce in the court that issued the decree in most cases. You can also ask for make-up time and for him to pay the travel costs.
Much of this will depend on the exact language of the decree, so you should sit down with a lawyer and have them review it with you and discuss the situation. Many will do this for a flat fee, or waive that fee if you end up hiring them for the case.
Please feel free to email me directly with any questions.
This answer is intended for informational and educational purposes only and should not be considered legal advice nor forming the attorney client relationship. This attorney is licensed in Texas.