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: hello. Can you tell me, What type of movies do you like? , USER: I like comedies. , ASSISTANT: okay. Why do you like comedies? , USER: Because they make Because they are fun they are fun to watch and that makes me laugh. , ASSISTANT: Can you tell me the title of one of your favorite movies? , USER: Ghostbusters
Ghostbusters