There are different types of airlines, for example low-cost carriers. If you have booked a flight with a low-cost carrier like Ryanair, Wizzair or Easyjet we can't access your booking or answer any questions regarding your booking because they use a separate booking system that we have no access to.
For any changes or cancellations, please contact the low-cost carrier directly. You can read more about this on the low-cost airline’s website and you will find your booking reference and contact information for the airline in your confirmation from them.