Through Account Manager
Through Ticketmaster.ca
Step 1: Log in to your Ticketmaster.ca account (https://www.ticketmaster.ca/).
Step 2: Click on your account name in the top right corner. Click on “My Tickets” from the drop down menu.
Step 3: Click on “See Details” for the event you want to cancel.
Step 4: Click on “Cancel” next to one of the tickets.
Step 5: An email will be sent to the sender and the recipient confirming the ticket offer has been canceled