Hei, I got the same problem. I was watching the conversation over on youtube (lol, I know!) but when I came to the 12'th conversation (evolving Corso) couldnt get it and I have like 6k points. I looked at youtube and the person who had uploaded the vid. was lvl 27. I guessed I just needed to get to lvl 27, but nooo. The icon "I want to talk to you" was on a few seconds and then gone..... I dont know if it is a bug.. guess we just need to play some more??