If you have reached out to said person already without a response, you could try a couple friendship spells to get him to contact you, but who is this person exactly? If you are speaking with a celebrity, they probably would not contact you even with a spell. A spell in this situation would not work unless you know the person in real life. Yes, there are love spells to attract new love into your life, but you wish to cast over a specific person, and it's less likely to work if you're not present in their offline life as well.
Remember, magic isn't the answer to everything, try talking with them one on one. The good/bad of the internet is anonymity, so if the person does not respond, or responds with a no, its not the end of the world, and you won't see the person daily.