Given the task definition and input, reply with output. Find the movie name from the given conversation. If the movie name is not found give output as "unknown"

ASSISTANT: What kind of movies to you like, and why do you like this type of movie? , USER: I like mysteries and thrillers, just cuz they're exciting and they keep you on the edge of your seat, and they also While you're watching them, you're trying to think of who If it's a murder mystery type thing, it's like who did it and how are they responsible? And it's a neat little kind of like a puzzle while you're watching the movie. , ASSISTANT: Can you name a particular movie that you like? , USER: I like Zodiac a lot, if we're talking thrillers.
Zodiac