If you need to contact Delta Airlines about your refund, you can do so by following these steps:

1. Visit the Delta Air Lines website (www.delta.com) and click on the "Support" link at the top of the page.
2. Click on the "Refunds" link, which will take you to a page with information about Delta's refund policies.
3. Scroll down to the bottom of the page and click on the "Submit a Refund Request" button.
4. Fill out the refund request form, providing all the necessary information, such as your name, ticket number, and reason for requesting a refund.
5. Once you submit the form, you should receive a confirmation email from Delta. You can expect to receive your refund within seven business days, but it may take longer depending on the payment method you used to purchase your ticket.

Alternatively, you can also contact Delta Air Lines customer service directly by calling their toll-free number at 1-800-221-1212. When prompted, select the option for "Refunds" and follow the instructions to speak with a representative.