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": "us", "description": "Fetches current or historical national average gas price data for the US.", "parameters": {"date": {"description": "The date for which historical gas price data is to be fetched, in the format 'YYYY-MM-DD'. If not provided, current gas price data is returned.", "type": "str, optional", "default": ""}}}]
I need to know the gas prices for the US on two different dates: March 15, 2022, and September 30, 2022.
user
assistant
[{"name": "us", "arguments": {"date": "2022-03-15"}}, {"name": "us", "arguments": {"date": "2022-09-30"}}]