I remember entering an elderly patient's room to give him a trash bag and asked "How are you today?" The simple question led to a simple "Fine. Thank you." Yet as I left the room, he called out to say, "Thanks for coming. You have no idea how nice it is to see a smiling face here." It was a moment that I will remember for the rest of my days. The people who enter the hospital are worried and frightened for themselves or a loved one.
This is the soul of the essay, right here. This is the experience. Do not use the word volunteering more than once in this essay, because it is not about volunteering, and volunteering is something admissions readers see all the time. Write about that moment.
Then, write about 'how it relates to the person you are.' You can do this by writing about your chosen field and how it helps you add happiness to people's days. Are you going into the field of medicine? That would be great...
Anyway, do not write about volunteering. Mention that you met the woman while you were volunteering, but do no twrite the conclusion paragraph all about volunteering. Let this be about a moment and about your reflection on that moment. Let it also be about your future as you tell how it will affect your professional life.