Intentions go a long way
"Deeds are but by intentions, and every person shall be rewarded according to his intention."
- (Bukhari)
Actions are based on intentions; you will only receive what you intend for. We should be on guard against our intentions at all times because they often change as much as the direction of the wind. When making Du'a1 you should have belief and patience in Allah as he has said; he will either give it to you straight away, give you something better or He will make you wait to test your patience.
It is easier said than done when someone tells you to remain calm and absolute. In fact many times you will find yourself twiddling your thumbs waiting for the clock to strike 12, entering a new day, a new beginning when all the while a bead of sweat trickles down and you're expecting your Du'a to have been accepted by now.