Canned lines are a great way to get the ball rolling. As you get into it you can perhaps make you own canned stuff or tweak other people's like I used to do.

Recently I've just been opening with 'Hi, you having a good night?' But then who's to say a girl hasn't heard that a thousand times. If you say any line in the world with enough conviction I'm sure she won't question you. She should play along if you play a good game. I've never had an issue to date canned or not canned.