Find the movie name from the given conversation. If the movie name is not found give output as "unknown"
Q: ASSISTANT: Hello. What kind of movies do you like? , USER: Hi. I really like the comedies and documentaries. , ASSISTANT: Me too. Why do you like this kind of movie? , USER: I find both of them entertaining in different ways. I think I really like things that make me laugh. I want to be in a good mood most of the time, and documentaries can be sad, but they're very informative, and I learn a lot about how other people live, so that's why I like those. , ASSISTANT: Can you name a particular documentary that you like? , USER: The one I This one that I really liked was Going Clear, about Scientology. I also really liked Thirteen.
A:
Thirteen