Thats fine man all you can honestly do is wait. If your opponent fails to respond by the deadline then all you'll have to do is show me a screenshot of your messages and I'll handle it. Don't freak out though, I'm a professional.

Also if he responds on like the last day or so and says he didn't manage to get in contact with you I'll either give you two an extension or hand you a Bye for the first round. So don't freak out my friend.