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 kinds of movies do you like? , USER: I really like romantic comedies. , ASSISTANT: Why do you like romantic comedies? , USER: They're fun. They're usually funny. They have a happy ending. They're more light-hearted in nature. And they're a nice escape. , ASSISTANT: alright , how about a movie you liked? , USER: One of my favorites is When Harry Met Sally.

When Harry Met Sally