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_cities_in_a_country", "description": "Fetches a list of cities in a specified country filtered by population range, with options for pagination.", "parameters": {"country_iso2": {"description": "The ISO 3166-1 alpha-2 code of the country.", "type": "str", "default": ""}, "page_size": {"description": "The number of cities to return per page. Default is 20.", "type": "int, optional", "default": 20}, "population_min": {"description": "The minimum population of the cities to include. Default is 0.", "type": "int, optional", "default": 0}, "next_token": {"description": "Token for pagination to fetch the next set of cities. Default is None.", "type": "str, optional", "default": ""}, "population_max": {"description": "The maximum population of the cities to include. Default is 100,000,000.", "type": "int, optional", "default": 100000000}}}, {"name": "expiry_date_enquiry", "description": "Queries the expiry date of a vehicle's license registration using the given registration number.", "parameters": {"rego": {"description": "The vehicle's registration number.", "type": "str", "default": "1HNT923"}}}, {"name": "search_by_url", "description": "Fetches data from a given Zillow URL using the RapidAPI key for authentication.", "parameters": {"currentpage": {"description": "The page number to retrieve. Defaults to 1.", "type": "int, optional", "default": "1"}, "url": {"description": "The Zillow URL to fetch data from. Defaults to a predefined URL for Brownsville, TX rentals.", "type": "str, optional", "default": "https://www.zillow.com/brownsville-tx/rentals/?searchQueryState=%7B%22pagination%22%3A%7B%7D%2C%22usersSearchTerm%22%3A%22Brownsville%2C%20TX%22%2C%22mapBounds%22%3A%7B%22west%22%3A-97.80795063281249%2C%22east%22%3A-96.96200336718749%2C%22south%22%3A25.648006723151287%2C%22north%22%3A26.253066850624663%7D%2C%22regionSelection%22%3A%5B%7B%22regionId%22%3A51167%2C%22regionType%22%3A6%7D%5D%2C%22isMapVisible%22%3Atrue%2C%22filterState%22%3A%7B%22ah%22%3A%7B%22value%22%3Atrue%7D%2C%22price%22%3A%7B%22min%22%3A40569%2C%22max%22%3A243413%7D%2C%22mp%22%3A%7B%22min%22%3A200%2C%22max%22%3A1200%7D%2C%22beds%22%3A%7B%22min%22%3A1%7D%2C%22cmsn%22%3A%7B%22value%22%3Afalse%7D%2C%22fr%22%3A%7B%22value%22%3Atrue%7D%2C%22fsba%22%3A%7B%22value%22%3Afalse%7D%2C%22fsbo%22%3A%7B%22value%22%3Afalse%7D%2C%22nc%22%3A%7B%22value%22%3Afalse%7D%2C%22auc%22%3A%7B%22value%22%3Afalse%7D%2C%22fore%22%3A%7B%22value%22%3Afalse%7D%2C%22sqft%22%3A%7B%22min%22%3A750%2C%22max%22%3A1500%7D%7D%2C%22isListVisible%22%3Atrue%7D"}}}]
What are the cities in the United States with a population between 1,000,000 and 5,000,000? Also, what is the expiry date of the vehicle with registration number 'XYZ789' in Washington?
user
assistant
[{"name": "get_cities_in_a_country", "arguments": {"country_iso2": "US", "population_min": 1000000, "population_max": 5000000}}, {"name": "expiry_date_enquiry", "arguments": {"rego": "XYZ789"}}]