ｅａｓｙｊｅｔについて

キャンセル可能な条件なのでしょうか？

www.easyjet.com/EN/Book/regulations.html#refunds

3 Refunds and cancellation fees

easyJet is a non-refund airline save as provided in our "Conditions of Carriage
for Passengers and Baggage" and in these Carrier's Regulations.

Conditions of Carriage Article 6.6

You may cancel your booking within 24 hours of making the original booking.

これが唯一の条件。もし、先ほど予約して、24時間以内ならばできるのですが・・
多分違いますよね。
Please note a cancellation can only be processed up to two (2) hours prior to
the flight's scheduled departure time. You will receive a refund (including APD
but excluding any credit card, transfer, speedy boarding, sports equipment,
or other administrative fees). A cancellation fee per passenger per journey
will be charged in accordance with the table below. Cancellation must be made
via our call centre on 0871 244 2366 (calls cost 10p per minute; calls from
mobiles and other networks may cost more. For other telephone numbers visit the contact us section). Refunds will be made to the credit or debit card used to make your booking.

easyJet regrets that it is unable to offer refunds in the event of passengers
being unable to fly owing to any change in personal circumstances, including
but not limited to medical grounds, with the exception of the application of
the 24 hour cancellation policy.

ということで、事故などであれば24時間の解除規定の例外となるそうですが、
証明書などが必要となるでしょうね。ああ、下にあります。あまり考えたくない
事例です。

In exceptional circumstances, however, easyJet will consider issuing a credit
in the event of the bereavement of an immediate family member (mother, father,
brother, sister, grandparent or child) provided that the claim and a copy of
the death certificate are submitted by post to the easyJet Customer Services Department.

All claims will be assessed entirely at the discretion of easyJet. This credit
will be to the value of the original fare paid, per passenger per journey,
and can be used against any future flights on easyJet within the following
six month period.

ということで、何もしないで放置するのが一番楽な方法だと思います。