Here are a few helpful words / phrases for using while we're there!

Hello, goodbye (informal) - Yia sou
Good morning - Kalimera
Good evening - Kalispera
Goodbye - adio
Goodnight - Kalinikta
How are you? - Ti kanis?
I'm fine - Kala ime
My name is... - Me lene...
What's your name? - Pos se lene?
Please - Parakalo
Thank You - Efharisto
The bill please - To logariasmo Parakalo
Do you have? - ehete?
Bread - psomi
Beer - byra
Can I have a beer please? - Boro na eho mia bera parakalo?
Cheese - tyri
Chicken - kotopoulo
Milk - ghala
Water - nero
What do you suggest? - Tee mu pro teenetay
Cheers - yamas
Yes - Nai
No - Oxi


Try this link to hear how some of them should be pronounced.

bbc