When I ask someone in castle volkihar how I can help they tell me Vingalmo has something for me and when I go to talk to him he doesn't have the dialog to give me a quest is there a way around this?

he is an extremely buggy quest giver.
beta testers reported this and beth ignored it,pretty much reload save or your screwed.

Got the same problem!!! hopefully this will be FIXED! the hole castle is bugged for me i think Serena's mother also aint there and she shud be in her lab!!!

You will never get a new quest from the vamps on that character now...it sux. Both my vamps have that bug

yeah its sad.
imo this is the biggest bug right now.
i was really looking foward to turning my wife into a vampire

ya do to someone geting kill in riften i can't move on in the side quests