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: when you look to watch a movie, what kind of movie is it usually? , USER: Something interesting and different. It doesn't have to be recent, and I like it usually I'll look at the reviews to make sure that it's not a bad movie that'll waste my time. , ASSISTANT: Do you use things like Rotten tomato scores?? , USER: Yes, I do. Yep. And I'd like to get an input from other people, not not movie critics most of the time. , ASSISTANT: okay, do you have a movie or multiple, you like rewatching? , USER: Yeah, I have a few. I like re-watching Back to the Future and the original Ghostbusters and the original Spider-Man.
original Spider-Man