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_user_dialog_string", "description": "Fetches the dialog string for a given user from the Waifu API.", "parameters": {"user_id": {"description": "A unique identifier for the user.", "type": "str", "default": "sample_user_id"}}}]
Fetch the dialog strings for users 'user14' and 'user15', who are contributors to an open-source project.
user
assistant
[{"name": "get_user_dialog_string", "arguments": {"user_id": "user14"}}, {"name": "get_user_dialog_string", "arguments": {"user_id": "user15"}}]