I'll regard that as a sincere, rather than cynical question. The answer is yes. If you studied Scripture, you'd be familiar with the person of Hezekiah, King of Israel. It was God's stated will that the king die at a prescribed time. That was announced to him. He prayed that his life be extended (even though it might be contrary to God's will). God acquiesced. The consequences to that life extension were regrettable -- the birth of the vile king, Manasseh (the king who sawed Isaiah to death). Hence, prayer can change events to conform or go contrary to God's will. Hence, we add "Thy will be done."