I'm not Charles

I'm trying to get Charles to eat a good dinner--rotisserie chicken and carrots. I got William to try the chicken by bribing him with a couple of Cheez-its. Charles wants some, too. I told him he needs to eat more carrots and chicken in order to get Cheez-its. He answered, "no." I said, "Charles, stop telling me no." He replied, "I'm not Charles. I'm William."