I'm super a fan! I would be even more a fan if I could figure out how to make reminders that advance the narrative! ^___^
You need to make the reminder after they stop sending you messages.
Click inside the Reminders window, then click the File button on the top bar, and then click the New button in that drop-down menu. As soon as you make the reminder, the dialogue should advance. :)
Oh, I figured it out eventually - I always do. It just takes me a while sometimes to see the plainly obvious. Just finished the game a few minutes ago.
I really appreciate all your help! And I appreciate your taking the time to reply to my earlier comment, too.