It's a system analysis and design question

The login page should be the first page that users see in the modified application. It should provide two text fields - one for entering a login name and one for entering a password. In addition it should have a command button that initiates the password checking action. If either of the text fields is left blank it is an error that must be reported to the user. If both fields are filled in but there is no record of the user name or the password is incorrect that must also be reported to the user. Users that have not yet registered cannot log in. They must first register by clicking on the register command button. They should be able to do this without getting an error for an empty name or password field. Based on the above case study, document login requirements using narrative use case