Hadits on Dua

Insya-Allah, Allah would answer all of our prayers. And there's three alternatives. First, Allah would answer our prayers. Second, or, Allah would hold our prayers and save it for our akhiroh later. Or, thirdly, Allah would replace our prayers with a better one, insya-Allah. And thus, it's a win-win situation. I got this from a hadits and please find it for yourselves.