A ticket-booking system needs to validate the number of tickets a customer wants to purchase in a single transaction. The customer must buy at least 1 ticket, up to a maximum of 6 tickets.

Develop an algorithm, using either pseudo-code or a flowchart, so that the number of tickets is validated to ensure the user is made to re-enter the number of tickets until a valid number (between 1 and 6 inclusive) is entered.

You should assume that the user will always enter an integer.