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. You will only need to pay 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 and the transaction tax known in some countries as ITBS or VAT. To contact us, please access the following link: https://www.arajet.com/en/contact-us. Once we receive a signed medical certificate detailing your illness and stating that you are "unfit to fly", our team will verify the information and issue an Arajet Voucher in the passenger's name.