A friend of mine once found herself seated next to Paulo Coelho (famous author of e.g. The Alchemist) on a flight. She was a huge fan, but out of respect for his privacy did not initiate any conversation.
Turns out he’s been flying to be part of a major talk show. The next night she watches the host ask the author about being famous. The author responds by saying that best part is that people approach him, and that he therefor gets to talk to so many different people, hear their stories and learn about their experiences.
So yeah. Say “thank you”.