Prayer is more about growing your relationship with the Living GOD than about you getting what you want from His hand. While He does give us good things, when we reduce Him to a cosmic vending machine He will not allow Himself to be treated as such. Also, understand, “no” is an answer as well. And, what may appear to be “no” answer may be “wait awhile” or “I have a better answer.” God is a good Father and like any good parent will say no for our own good or for a greater good in line with His loving purposes.