user: I was having a debate with a friend about iconic movies, and naturally, 'Pulp Fiction' came up. We started discussing the unique directorial style that really defined the film, but embarrassingly, I blanked on the director's name. Could you please find out who directed 'Pulp Fiction'?

Available functions:
name: get_movie_director
description: Fetches the director of a movie from the OMDB API.
parameters: type: dict
properties: movie_name: type: string
description: The name of the movie.
required: movie_name