system: 
You are an expert in composing functions. You are given a question and a set of possible functions.
Based on the question, you will need to make one or more function/tool calls to achieve the purpose.
If none of the function can be used, point it out. If the given question lacks the parameters required by the function,
also point it out. You should only return the function call in tools call sections.

If you decide to invoke any of the function(s), you MUST put it in the format of [func_name1(params_name1=params_value1, params_name2=params_value2...), func_name2(params)]

You SHOULD NOT include any other text in the response.

Here is a list of functions in JSON format that you can invoke.

[{'name': 'Events_3_FindEvents', 'description': 'Finds cultural events, such as concerts and plays, happening in a specified city on a given date. Note that the provided function is in Python 3 syntax.', 'parameters': {'type': 'dict', 'required': ['event_type', 'city'], 'properties': {'event_type': {'type': 'string', 'description': 'The type of cultural event to find.', 'enum': ['Music', 'Theater']}, 'city': {'type': 'string', 'description': "The city in which to search for events, in the format of 'City, State', such as 'Berkeley, CA' and 'New York, NY'."}, 'date': {'type': 'string', 'description': "The date of the event, formatted as 'MM/DD/YYYY'. If not specified, the search will include events for all upcoming dates.", 'default': 'dontcare'}}}}, {'name': 'Events_3_BuyEventTickets', 'description': 'Purchase tickets for a specified cultural event on a particular date in a selected city. Note that the provided function is in Python 3 syntax.', 'parameters': {'type': 'dict', 'required': ['event_name', 'number_of_tickets', 'date', 'city'], 'properties': {'event_name': {'type': 'string', 'description': 'The name of the artist, play, or cultural event.'}, 'number_of_tickets': {'type': 'integer', 'description': 'The quantity of tickets to purchase. Must be a positive integer and typically ranges from 1 to 8.'}, 'date': {'type': 'string', 'description': "The specific date of the event, in the format 'YYYY-MM-DD'."}, 'city': {'type': 'string', 'description': "The city where the event will take place, formatted as 'City, State' or 'City, Country' if the city does not locate in the United States, such as 'New York, NY' or 'London, UK'."}}}}, {'name': 'Movies_3_FindMovies', 'description': "Retrieve a list of movies based on specified criteria that match the user's preferences. Note that the provided function is in Python 3 syntax.", 'parameters': {'type': 'dict', 'required': [], 'properties': {'directed_by': {'type': 'string', 'description': "The first and last name of the director of the movies to filter by. Use 'dontcare' if the director is not a filtering criterion.", 'default': 'dontcare'}, 'genre': {'type': 'string', 'description': "The genre of the movies to filter by. Select 'dontcare' to include all genres.", 'enum': ['Offbeat', 'Fantasy', 'World', 'Mystery', 'Thriller', 'Comedy', 'Comedy-drama', 'Horror', 'Animation', 'Sci-fi', 'Cult', 'Drama', 'Anime', 'Family', 'Action', 'dontcare'], 'default': 'dontcare'}, 'cast': {'type': 'string', 'description': "First and last names of lead actors or actresses in the movies to filter by. Use 'dontcare' if the cast is not a filtering criterion.", 'default': 'dontcare'}}}}]


user: I'm in the mood for a film tonight. Could you retrieve a list of movies that feature Nikita Mehta in the leading role?

Available functions:
[{"name": "Events_3_FindEvents", "description": "Finds cultural events, such as concerts and plays, happening in a specified city on a given date.", "parameters": {"type": "dict", "required": ["event_type", "city"], "properties": {"event_type": {"type": "string", "description": "The type of cultural event to find.", "enum": ["Music", "Theater"]}, "city": {"type": "string", "description": "The city in which to search for events, in the format of 'City, State', such as 'Berkeley, CA' and 'New York, NY'."}, "date": {"type": "string", "description": "The date of the event, formatted as 'MM/DD/YYYY'. If not specified, the search will include events for all upcoming dates.", "default": "dontcare"}}}}, {"name": "Events_3_BuyEventTickets", "description": "Purchase tickets for a specified cultural event on a particular date in a selected city.", "parameters": {"type": "dict", "required": ["event_name", "number_of_tickets", "date", "city"], "properties": {"event_name": {"type": "string", "description": "The name of the artist, play, or cultural event."}, "number_of_tickets": {"type": "integer", "description": "The quantity of tickets to purchase. Must be a positive integer and typically ranges from 1 to 8."}, "date": {"type": "string", "description": "The specific date of the event, in the format 'YYYY-MM-DD'."}, "city": {"type": "string", "description": "The city where the event will take place, formatted as 'City, State' or 'City, Country' if the city does not locate in the United States, such as 'New York, NY' or 'London, UK'."}}}}, {"name": "Movies_3_FindMovies", "description": "Retrieve a list of movies based on specified criteria that match the user's preferences.", "parameters": {"type": "dict", "required": [], "properties": {"directed_by": {"type": "string", "description": "The first and last name of the director of the movies to filter by. Use 'dontcare' if the director is not a filtering criterion.", "default": "dontcare"}, "genre": {"type": "string", "description": "The genre of the movies to filter by. Select 'dontcare' to include all genres.", "enum": ["Offbeat", "Fantasy", "World", "Mystery", "Thriller", "Comedy", "Comedy-drama", "Horror", "Animation", "Sci-fi", "Cult", "Drama", "Anime", "Family", "Action", "dontcare"], "default": "dontcare"}, "cast": {"type": "string", "description": "First and last names of lead actors or actresses in the movies to filter by. Use 'dontcare' if the cast is not a filtering criterion.", "default": "dontcare"}}}}]

Ground-truth function call:
[{"Movies_3_FindMovies": {"directed_by": ["", "dontcare"], "genre": ["", "dontcare"], "cast": ["Nikita Mehta"]}}]