Yeah I had the same thing happen, only about 2 or 3 times and I'm level 53 now. I would just ask in general chat if there was anyone to help, and usually there was. The one time there wasn't, I just logged out and went for a walk. Came back, asked again, and there was someone to help me. Also can just skip and come back later. Not too many of these are super important chains IMO. The guide is crazy awesome. I've done a bunch of dungeons and random grinding so I'm actually 5 levels above where it says I should be but I'm still having zero issues and haven't had a quest turn grey yet! Best guide ever!