I called the Thai Embassy in Canada about that issue, waiting for them to call back, we do not have the passport number on our vaccination certificate either...
What a convoluted system... need all that info, so you need airline, hotel, certification, insurance and you do not know if Thailand will accept... so you basically roll the dice and hope it will work and if not you are screwed with plane tickets you cannot cancel on most instances and if you need to re-schedule you will have to redo the whole process.
They ask too much for the PASS... remove the dates, remove the flight number, just verify if people are qualified and then ask for more information later... what is wrong with them.