Don’t worry. The exact flight you choose does not have to be used by the recipient. If they’d prefer to do a different flight they can do so. At checkout the gift certificate code will deduct the amount that’s been prepaid from their total.
When the recipient of the gift certificate is ready to book their flight they can select the flight of their choice, click the green “Book Now” button, and enter their booking and payment information. The gift certificate code is used before payment is made by clicking the blue “Have A Code” text as seen in the image.