How To Write A Formal Letter In Italian . “nella speranza di” instead of “spero di”. Even if you’re at a beginner level you will surely know that the most common way to say “hello” in italian is “ciao”. A Quick Guide to Writing a Formal Letter in Italian Talk in Italian from talkinitalian.com Each state has laws for how long a letter like this is good for. “le ore 13” instead of “l’una”. Cordiali saluti (kind regards for small companies ), distinti saluti (best regards from big companies or school) or in fede (sincerely for public offices).