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_9gag", "description": "Checks if a given username is available on 9gag using the RapidAPI service.", "parameters": {"username": {"description": "The username to check for availability on 9gag.", "type": "str", "default": "username"}}}]
Check if the username 'john_doe' is available on 9gag.
user
assistant
[{"name": "get_9gag", "arguments": {"username": "john_doe"}}]