Por favor quiero cancelar cualquier gestión de la reserva que he hecho

He recibido este mensaje de parte de ustedes : por favor quiero cancelar cualquier gestión de la reserva que he hecho. Gracias.
thank you for choosing flightnetwork. There was a problem with your flight booking. Unfortunately, your reservation has failed to come back in a timely manner with a valid confirmation number. This could be due to a number of reasons, one of the most common being that flight network is unable to obtain an authorization on your credit card for the entire cost of your ticket(s). Many airlines put reservations on hold, protecting the seats until payment is confirmed but, because the price cannot be guaranteed until the ticket is issued, it's important we get in touch with you as soon as possible.

i have tried to call you on the number you provided in your booking attempt however, i am not able to reach you hence the reason for my email.​

"please note fares are subject to change at any time, even prior to the ticketing deadline"