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": "generate_cc_number", "description": "Generates a fake credit card number using the specified brand and API key.", "parameters": {"brand": {"description": "The desired card brand (e.g., 'Visa', 'MasterCard'). Defaults to None.", "type": "str, optional", "default": ""}}}]
Generate a credit card number for each of the following brands: Visa, MasterCard, American Express, and Discover.
user
assistant
[{"name": "generate_cc_number", "arguments": {"brand": "Visa"}}, {"name": "generate_cc_number", "arguments": {"brand": "MasterCard"}}, {"name": "generate_cc_number", "arguments": {"brand": "American Express"}}, {"name": "generate_cc_number", "arguments": {"brand": "Discover"}}]