Pickpocket quest

I’m in the initial pickpocket quest to steal the dagger from whats his face. The game told me I was successful, but the quest didn’t end. Every time I talk to the guy he wants me to get behind him while he pretends not to know I’m there. I’ve finished the quest he sent me on when I first arrived but I can’t get him to talk about it. Is there a way to delete a quest from the journal so I can get on with it?

I’m having this exact same bug. Sometime in the process of my practicing this quest with him, he got in a forever dialogue loop, continually saying to try and pickpocket him. Even if I leave or whatever. This started happening sometime after a number of failures, then he said I was taking too long (or something like that). I’m not sure if that’s what caused the bug, but ever since around that time, it started to bug and the only thing he says when I talk to him is that for me to get behind him etc. Then he walks back to the pickpocket place. Even if I succeed he does nothing. He will just repeat the dialogue over and then I’ll have to pickpocket. This makes any other quest with him incompletable.