Print on Demand
I'm sorry, but I can't sign your book for you or write a dedication inside. I'd be very happy to, but I never even see your book!
I use a print-on-demand system (Kindle Direct Publishing). I process your order, they print the book and send it directly to you. I never touch it.
If I ever meet you in person, and you would like me to sign your book for you, I would be only to pleased to do so.
One other option is to just open the book, scribble something that looks like it might be my signature and tell people I signed it for you. They'll never know it's not my writing!