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": "flag_riddle", "description": "Flags a riddle for further review using the specified criteria.", "parameters": {"is_id": {"description": "The unique identifier of the riddle to be flagged.", "type": "str", "default": "63bdef027183b71946b64ee6"}, "flag": {"description": "The type of flag to be applied to the riddle (default is 0).", "type": "int, optional", "default": "0"}}}]
A riddle with the unique identifier '17181920' is missing crucial information for solving it. Flag this riddle as 'missing information'.
user
assistant
[{"name": "flag_riddle", "arguments": {"is_id": "17181920", "flag": 3}}]