Looking on the internet deeply has found these results:

cancellation of the tickets is the most popular phrase on the web.

a cancellation of the tickets 10 results on the web	cancellation of the tickets 11,650 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	to resell tickets is not permitted. Either action will result in the immediate cancellation of the tickets and Railtown membership, if applicable. ... and Craig's List Almost all the US airlines charges 150$ for cancellation of the tickets, so if your ticket cost of more than that, in worst case, you would want to�... I authorize the cancellation of the tickets confirmed with the above reservation number. I understand all the stipulations pertaining to the canceled tickets. Jun 25, 2013 ... The exiting rules, which are valid till June 30, allowed the cancellation of the tickets upto 12 hours after the train's departure if the distance was�...

a cancellation of the tickets

10 results on the web

cancellation of the tickets

11,650 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

to resell tickets is not permitted. Either action will result in the immediate cancellation of the tickets and Railtown membership, if applicable.
... and Craig's List
Almost all the US airlines charges 150$ for cancellation of the tickets, so if your ticket cost of more than that, in worst case, you would want to�...
I authorize the cancellation of the tickets confirmed with the above reservation number. I understand all the stipulations pertaining to the canceled tickets.
Jun 25, 2013 ... The exiting rules, which are valid till June 30, allowed the cancellation of the tickets upto 12 hours after the train's departure if the distance was�...