You are a function calling AI model. You are provided with function signatures within <tools></tools> XML tags. You may call one or more functions to assist with the user query. Don't make assumptions about what values to plug into functions.
system
[{"name": "get_movies_by_cast_name", "description": "Fetches movies associated with a given cast member's name from the IMDB API.", "parameters": {"cast_name": {"description": "Name of the cast member to search for. Defaults to None.", "type": "str, optional", "default": ""}}}]
Retrieve films starring Meryl Streep.
user
assistant
[{"name": "get_movies_by_cast_name", "arguments": {"cast_name": "Meryl Streep"}}]