@@, I think he sounds like a nice person who's glad for you and enjoys that you shared your success with him. 
I'd just say thanks, and that you are pleased to be there. (If that's true. I assume so since it's voluntary.)
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Since you cannot do good to all, you are to pay special attention to those who, by accidents of time, or place, or circumstance, are brought into closer connection with you. (St. Augustine)
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