Dude... you're on the right tracks. Day Game (for me that means any place outside a nightclub) just be very direct.

"Excuse, I just saw you from over there and I thought you looked really nice, and I just had to come and say hello..." This will 8 / 10 get you in with a smile with her saying "Awww thank you". Then get her talking about herself... let her do the talking...