travel credit info

this is the email response i received from united: where can i find this as nothing is showing up in our travel credits tab

We're sorry you were unable to use your ticket as originally planned.

We show your reservation was not cancelled prior to departure. The ticket and all the other products associated with this travel have lost their value for refund or exchange. However, in consideration of your situation, we made a one-time exception to allow you to exchange your travel ticket. The exchange must be completed within a year from the ticket issue date. A service charge as well as any applicable fare difference will be applied at the time of the exchange. For rescheduling information, please visit united.com or call 1-800-UNITED1. For a complete list of our worldwide offices, please view https://www.united.com/web/en-US/content/contact/reservations/default.aspx.

Thank you for choosing United Airlines.