Definition: Find the movie name from the given conversation. If the movie name is not found give output as "unknown"
Input: ASSISTANT: What kinds of movies do you like? , USER: I like science fiction. , ASSISTANT: Well, tell me why do you like sci-fi? , USER: I've always been interested in astronomy, and the planets, and the solar system, and the galaxy that we live in, and the universe in general. , ASSISTANT: how about a movie you liked? , USER: I definitely liked all the Star Trek movies.
Output:
Star Trek