That could have gone a lot better if Cole had to be honest. Of course the Dragon refused to hand over Peronico, but Cole never expected it to do in the first place anyways. However asking the dragon if he could at least speak to the man and his family before he left on his assassination mission was a success.
Cole did not ask for a meeting for nothing, while he would try his best to find a map or blueprint to the volcano once he is out in the city, he at least wanted to use his own eyes and mind to find the best path and route to escape if he ever needed to break out Peronico and family.