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": "label_template_brands", "description": "Returns the list of blank label sheet brands supported by Ecardify on the given date.", "parameters": {"format": {"description": "The paper size format, which can be either \"Letter\" (8.5 inch by 11 inch) or \"A4\" (210 mm by 297 mm).", "type": "str", "default": "a4"}}}]
I'm looking for brands that offer both Letter and A4 size label sheets. Can you help?
user
assistant
[{"name": "label_template_brands", "arguments": {"format": "Letter"}}, {"name": "label_template_brands", "arguments": {"format": "A4"}}]