Elaine Schmitz, author of Recipes & Recollections of My Greek-American Family, put greetings in her email to me which I asked what they meant. They are below and might be useful if you want to put in a little Italian or Greek into your story’s dialogue.
In Italian:
Buon giorno is Good morning, Buon pomariggio is Good day. Buona notte is Good night.
In Greek:
kalimera is Good morning and kalispera is Good day, kalinikhta is good night.
Julaina Kleist-Corwin 
Now all we need to know is how to pronounce all that.
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Elaine can help us with that.
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Imponente (awesome in Italian)! Charis (thanks in Greek).
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Thanks, Lady Winfred, two more words to know.
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