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": "nearest_metro_station", "description": "Finds the nearest Delhi Metro station to the given longitude and latitude.", "parameters": {"long": {"description": "The longitude coordinate.", "type": "str", "default": "77.2122"}, "lat": {"description": "The latitude coordinate.", "type": "str", "default": "28.5729"}}}]
What is the closest metro station to the coordinates 77.209021 and 28.613939?
user
assistant
[{"name": "nearest_metro_station", "arguments": {"long": "77.209021", "lat": "28.613939"}}]