Just say anything, it doesn't matter WHAT you say. Besides, being good at conversation does NOT gaurantee that she's attracted. If you're just good at conversation, she might be interested in you as a friend, but not really attracted to you. Besides, you're going in for rapport too early. Before you go for rapport, you've got to hook her and attract her. The way you go about doing this is negging her, using C+F, teasing her, basically, you use attraction techniques. Once she's hooked and you'll know that when she's probably laughing and stuff, THEN you can start going for rapport and asking her stuff like "How was your weekend?". If you go for rapport from the start, she won't know your value and thus will show disinterest.