Expedia emailing Air Canada on my behalf

AC cancelled a leg of my flight from YVR to HKT in January 2023, specifically the flight from YVR to HKG. Expedia (who I booked this through) wasn't able to find a suitable flight around my travel dates and offered to email AC for them to find us an alternative, or I can take the full refund. Rebooking is more $ than originally, so I asked them to try emailing first.

Just wondering if anyone has experience with this/what AC might come back with?