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The quickest way for him to see it is to post it publically on his FB page. I sent him a private message on his blog 2 months ago and still haven't got a response, so I don't know if what you need is time sensitive, if so looks like the FB route is the way to go. Good luck.
I used the Ask John link to ask about a table for our family cruise in Nov (9 people); got a reply from one of his "flunkys" about contacting the matre D' when we boarded (which is not how he replies to people on his blog).
If you want a personal reply Facebook is the way to go.
I still cruise for Warm Chocolate Melting Cake (with 2 sugar-free vanilla ice-creams)
"I can see Carnival Inspiration, Miracle, and Imagination from my front porch" (to paraphrase Tina Fey as S. Palin)