Presumably they pray to find an answer. Sometimes, of course, the answer is "no".
Please bear with me, I do not mean this as a sarcasm. If the prayer is for an "answer", I presume you mean to some question, as a request for an explanation or information. How can the answer to such a question be "no?"
Also, what is the question. For example, in light of 9/11, what would have been the question that would have brought it on?
Hank