Assuming that you are expecting to cancel your booking with Air Canada, you should go through the Air Canada Flight Cancellation Policy which is made to support travelers with their cancellations and refunds. Under this arrangement, cancellations made within 24 hours of booking and 7 days before the scheduled flight are absolutely free. Additionally, there are different procedures for cancellation, online as well as offline. You can drop your ticket straight by signing into your account on the Air Canada site or by approaching their customer helpline number. After the cancellation process is effectively finalized, you will get a confirmation email after which your refund will be transferred within 7 to 10 days.