First off, make sure your lips are fine and dandy. Nobody wants to kiss a cold sore, chapped lips, or layers of sticky lipstick.
A dash of lipstick and some subtle puckering is a good place to start. Try putting your hand over your mouth when you laugh (preferably at something funny he says).
Get close to him. If it’s chilly outside, try “I’m so cold” and snuggle in a little. If you aren’t outside… get outside or find an air conditioner.
Eye contact plays a big part in getting a man to kiss you. He likes to know you’re invested in him and what he’s saying.
Close the gap between you so he doesn’t have far to go to make contact with your lips. This will show him you’re interested.