Ramadan: Can Dua change fate?

Fate is what God already knows about you. Free will is the choices you make because you don't know about yourself. When you make dua, God already knows whats coming for you. He's pleased by your asking for help but he knows you better and will always give you what is best. When you pray for something that is in your well interest he gives it to you, just for asking. You get good deeds counted for any duas that weren't fulfilled because God just wants us to pray to him.