It's much easier to do this over at www.expedia.ca

Go to flights. Over on the left, click on "Lowest fares". Make sure you specify Air Canada on the next screen.

You'll get a listing of the various fares on that route.....each of which lists the particular fare class (Q, L, etc) in long form. Choose the V or H or B....and then you get a chance to see if the dates you want it for are available.

Works like a charm.

But don't try it at www.expedia.com....only at the dot-ca (www.expedia.ca) site