How do I tell him I'm not interested?

Honesty is always the best policy, if your not interested just flat say so, say sorry man you seem pretty cool but just so you know I'm not looking to get in a relationship other than friendship with you. But be aware he could just be a friendly guy and not actually interested, you could be worried for nothing, has he actually made a move? Touching your hair is not asking you on a date, Anytime a person makes you uncomfortable you have the right to say point blank, Your in m space please back off. If he doesn't then walk away, if he pursues you have the right to scream and defend yourself. But really just be honest with the guy say hey, your cool but not the kinda guy I am looking to date or say that your not looking to date anyone right now..