Prague is 8 hours ahead of Vancouver
Best overlap: 8:00 AM to 10:00 AM in Vancouver is 4:00 PM to 6:00 PM in Prague.
Target 8:00 AM to 10:00 AM in Vancouver, which lands at 4:00 PM to 6:00 PM for the Prague side. Prague is 8 hours ahead of Vancouver, so common hours are scarce (about 2 hours). Lock the slot, keep it short, and follow up in writing.