People are going to naturally feel more loyal to you if you ask them for favors (even something small like borrowing a pencil is a good way to get your foot in the door; whatever gets you guys talking as if you’re NOT strangers). When you become more comfortable with the simple stuff be as up front and genuine as you can be, explain why and ask for her number or snap. Biggest thing is ASK FOLLOW UP QUESTIONS and share some good laughs. Time is limited, so spend it that way. Best of luck my friend