CSA - can't find the flight in the archive

Hi all,

I’m trying to check the takeoff/landing time of my flight which was delayed for 2 hours in the airport + approx. 1 hour in the aircraft. It’s OK710 (Czech Airlines), Prague - Lisbon, took place on 29th of June 2018, 16.00 (scheduled time). I can’t find it in the archive - the closest one is on 27th of June. Could the flight be missing in the archive?