Implement a Bank Account class in Python. The initial balance of an account should be zero. A bank account must be associated with a customer, who is represented by a first name and a last name.

The bank account should support two operations: withdraw and deposit. Withdraw operation should decrease the bank balance by the specified withdrawal amount (make sure to check for negative balance!), and deposit should increase the balance by the specified amount.

Implement a Bank Account' class in Python. The initial balance of an account should be zero. A bank account must be associated with a customer, who is represented by a first name and a last name. The bank account should support two operations: withdraw and deposit. Withdraw operation should decrease the bank balance by the specified withdrawal amount (make sure to check for negative balance!), and deposit should increase the balance by the specified amount