Alma 25:17

"And now behold, Ammon, and Aaron, and Omner, and Himni, and their brethren did rejoice exceedingly, for the success which they had had among the Lamanites, seeing that the Lord had granted unto them according to their prayers, and that he had also verified his word unto them in every particular."

The Lord does answer our prayers, especially if we pray for something that He wants too. These men prayed for missionary opportunities, and they certainly got them!