What would you have told the person at the time, if you had known then you'd never see them again?

My Great-Grandma was really sick and the last time I visited family in California, I told her I’d come back and see her before I got back on a plane home. She looked really sad and said not to come back because she didn’t want me to see her like this. (She was always dressed fancy, with her hair freshly blond and curled, and pleasantly grandmotherly plump) Her illness had made her skin a funny darker color, her hair was gray and flat, and she had lost a lot of weight and just looked sick. I didn’t go back and I regret not doing so because that was the last memory I have of her.

If you could go back, what would you have said to the person you’d never see again?