An easy solution is "salve" wihich is more formal than "ciao" and less
formal than "Buongiorno" etc.
"Ciao" is fine in an equal status situation like friend/friend or same
age relationship, but it would be a little strange in a situation like
shop assistant/customer or in case of age gap, whereas "salve" passes
in almost all cases.
Try "salve" and see how it goes.
Peace
Cris
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