If you want to use LFG for a group dungeon on normal - they give a level range. If you are above the level range can you still use the LFG for a group dungeon? If so how far above can you be?
If you are too high (IDK the cut-off) the dungeon for that zone will no longer show up. So you just have to ask in chat, and IMO this is the best option as the LFG its not really the best.