What is Requirement Engineering process explain with the help of diagram? Find the functional and non-functional requirements of the given case study. An automatic ticket issuing system sells rail ticket. User select their destination and input a credit card and a personal identification number. The rail ticket is issued and their credit account charged. When the user presses the start button, a menu display of potential destinations is activated, along with a message to the user to select a destination. Once a destination has been selected, users are requested to input their card. Its validity is checked and user is then requested to input a personal identifier. When the credit transaction has been validated, the ticket is issued