It looks like the reason you haven't had a reply since January is because 'xronia polla' may not be correct in spelling. This sounds close but until I can find out more, this is the greeting for namedays... khroneea pola, means best wishes. The underline indicates an accent.

Good Morning = Kaleemera
Good afternoon = Kaleespera
Good night = Kaleeneekhta
Hello = Kherete
Goodbye = Kherete/ Ya sas/ Andeeo
Excuse me = Parakalo (for getting attention)
Sorry = Seeghnomee
Thank you = Efkhareesto (often shortened to 'sto')
Please = Parakalo
Okay = Endaksee
My name is = Leghome - Judy
How are you = pos eese
Try this... Kaleemera Constantine, pos eese?
More later

Regards
Chris