Oil filter changed

I was traveling from New Market, VA to home in Morristown, TN and I realized my car was leaking something. I called this garage and they agreed to look at my car. I was in and back on the road in about an hour. The people at this garage were exceptionally nice and so polite. I asked what I owed when they were through and the man said nothing. He said he could not charge me and stated that he just hoped that someone would help his wife if she had issues and was that far from home.