When you’re really attracted to someone, sometimes you just run out of things to say. It has happened to me. Don’t be afraid to take the conversation in a new direction. Maybe mention an event that’s coming up and say why you like that kind of event. Maybe mention something he’s said and ask him about it – you show interest that way and give him a chance to talk about himself. Don’t bring up negative things. If you end up seeing each other there will be plenty of time for that.