Dungeon finder problem

I don’t know if this is a bug or not, so I just put it under the bug report category just in case. My friend is new to WoW and he has just reached the level to access the dungeon finder. His dungeon finder seems to be having a problem that won’t allow him to queue up. He opens the dungeon finder, selects his role, but is unable to select any dungeons. He does not have the ability to search for a random dungeon (there is no option allowing him to do so), and in the “specific dungeons” category there are no dungeons listed. If he clicks the “find group” button without selecting a dungeon, a message appears that says “you did not select any valid slots”. I have done multiple dungeons using the dungeon finder, but when I party up with him, I begin to have the same problem. If anyone has encountered this problem before and knows how to fix it please let me know.