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": "search_hashtags", "description": "Search for Instagram hashtags by keyword using the RapidAPI service.", "parameters": {"name": {"description": "The keyword to search hashtags for.", "type": "str", "default": "fitness"}}}, {"name": "get_username_by_user_id", "description": "Fetches the Instagram username associated with a given user ID using the specified RapidAPI key.", "parameters": {"is_id": {"description": "The Instagram user ID.", "type": "int", "default": "18527"}}}, {"name": "highlights", "description": "Fetches the Instagram story highlights for a given username using the Toolbench RapidAPI service.", "parameters": {"username": {"description": "The Instagram username for which to fetch story highlights. Defaults to 'kimkardashian'.", "type": "str", "default": "kimkardashian"}}}, {"name": "getlenscreators", "description": "Fetches Lens creators from the Snapchat API using the provided parameters.", "parameters": {"cursor": {"description": "A cursor indicating the starting point for fetching Lens creators. Defaults to None.", "type": "str, optional", "default": ""}}}]
Given the user_id '456123789', find the associated Instagram username and search for hashtags related to the obtained username.
user
assistant
[{"name": "get_username_by_user_id", "arguments": {"is_id": 456123789}}, {"name": "search_hashtags", "arguments": {"name": "<USERNAME_FROM_PREVIOUS_CALL>"}}]