Start your conversation by complimenting the person you want to talk to with these examples only because it'll guarantee you a conversation starter. Compliment on there clothing, Hair, and face. When I mean face I mean like there smile or there eyes. Remember to smile in a innocent way so you don't scare them.
Step2
When you are done with step 1 you have just softened the person up so you then introduce yourselves. Make sure you talk clearly and audible, not loud but audible.
Step3
When your done introducing yourself you then curve the conversation back to the person and have them talk about themselves so when you leave you'll leave a good impression on that person. When you leave make sure you give them that one last big smile that they know is a million dollar smile. You have just made a friend and had a good conversation.