Function: get_all_credit_cards
This tool belongs to the travel system, which allows users to book flights, manage credit cards, and view budget information. Tool description: Get all registered credit cards
Response: credit_card_list: type: dict
description: A dictionary containing all registered credit cards
properties: card_number: type: string
description: The number of the credit card
expiration_date: type: string
description: The expiration date of the credit card in the format YYYY-MM-DD
cardholder_name: type: string
description: The name of the cardholder
card_verification_value: type: integer
description: The verification value of the credit card
balance: type: float
description: The balance of the credit card