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": "methane_endpoint", "description": "Fetches methane concentration data from the specified API endpoint using the RapidAPI service.", "parameters": {"methane": {"description": "Optional parameter to specify a particular methane concentration. Defaults to None.", "type": "str, optional", "default": ""}}}, {"name": "airports_by_keyword", "description": "Fetches a list of airport names and their IATA codes that match the given keyword.", "parameters": {"keyword": {"description": "A search term to match against airport names and IATA codes.", "type": "str", "default": ""}}}, {"name": "evaluate", "description": "Evaluates a mathematical expression using the given variables and their values through the RapidAPI service.", "parameters": {"variables": {"description": "A comma-separated string listing the variables used in the expression.", "type": "str", "default": ""}, "values": {"description": "A comma-separated string listing the values corresponding to the variables.", "type": "str", "default": ""}, "expression": {"description": "The mathematical expression to be evaluated.", "type": "str", "default": ""}}}]
I need to know the methane concentration in the atmosphere at a specific time. The time is represented as '2022-10-10T12:00:00Z'. Please provide the data.
user
assistant
[{"name": "methane_endpoint", "arguments": {"methane": "2022-10-10T12:00:00Z"}}]