I want to ask for help if I can cancel my flight and return the money or move my flight...

I want to ask for help if I can cancel my flight and return the money or move my flight for another date I will explain the reason.*Three years ago my father-in-law passed away. We hired a funeral service where the reason is to take him to give his Christian selpultura to Guatemala. the agent of the funeral home had given us a date where he would buy the flight to send the body of my fire and it would be the day ** to October ** but * hours ago the agent of the funeral home informed me that he had not found a flight and that I knew if it would be possible to send the body in these days. leaving us in a bad position because also for work we do not have many days of leave and also my flight was for a date and the main thing for me is to be with my husband and be in the last residence of my father-in-law.*I ask you to really understand me we are so disappointed of the funeral home by the time*delayed and being unresponsive with us since we now do not find ourselves in this situation because we would lose our presence the moment the body arrives in Guatemala and without anyone receiving it, since his wife and children are all moving from Houston to Guatemala at that moment of his Christian Sepultura*therefore I take the boldness to lose the help to cancel my flight and return my money because as you can verify the funeral agent does not have a date agreed to send the body of my father-in-law and until you have safe date I can not travel please can you help and undernstand my position and can give my money back . because I don't have date for flight for my father in law and I cant flight is not sure date for flight for my father in law yet