Alyson Wehner

So im on the quest "go to the dungeons" and i have to find Nathalie and Sevilin and then report back to Eye Memora but the problem is I cant find them! I kept going into the dungeons and the surrounding areas and CANNOT find them! I keep looking through the internet in hopes of finding an answer but I cannot find one. PLEASE HELP! Oh and it's Avadon: The Black Fortress.