We are very sorry about your situation and hope you recover soon. You can modify your reservation up to 3 hours before the flight date by logging into arajet.com and changing the date/route of your flight, paying only the fare difference and the change fee if applicable according to your fare. If you are unsure when you will be fit to fly, you have up to 7 days after the flight date to request a refund through a voucher for the amount paid. In this case, Arajet will only retain the amount corresponding to the fuel. To contact us, please access the following link: https://www.arajet.com/en/contact-us. Our team will verify once we receive a signed medical certificate detailing your illness and declaring that you are "unfit to fly", after which we will issue an Arajet Voucher in the passenger's name.