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_3_fluctuation_endpoint", "description": "Fetches the percentage change in exchange rates for specified currencies over a given time period.", "parameters": {"end_date": {"description": "The end date for the time period of the fluctuation data.", "type": "str", "default": "2023-02-28"}, "base": {"description": "The base currency for which the fluctuation data is to be retrieved.", "type": "str", "default": "eur"}, "start_date": {"description": "The start date for the time period of the fluctuation data.", "type": "str", "default": "2023-01-01"}, "symbols": {"description": "Specific currencies for which the fluctuation data is to be retrieved. Defaults to 'usd'.", "type": "str, optional", "default": "usd"}}}]
What was the percentage change in the exchange rate of the Japanese yen against the US dollar, the euro, and the British pound from January 1, 2019 to January 1, 2020?
user
assistant
[{"name": "get_3_fluctuation_endpoint", "arguments": {"end_date": "2020-01-01", "base": "JPY", "start_date": "2019-01-01", "symbols": "USD,EUR,GBP"}}]