Dallas is 15 hours behind Melbourne
Best overlap: 8:00 AM to 9:00 AM in Melbourne is 5:00 PM to 6:00 PM in Dallas.
Your shared working hours run 8:00 AM to 9:00 AM in Melbourne (5:00 PM to 6:00 PM in Dallas). There's roughly 1 hour to share, so keep agendas lean and meet at 8:00 AM in Melbourne (5:00 PM in Dallas) to use every minute. Double-check the weekday, too: Dallas sits on the previous day from Melbourne during these hours.