An Italian Phrase for Buying a round-trip ticket: "Un biglietto di andata e ritorno per Firenze, per favore."

"Un biglietto di andata e ritorno per Firenze, per favore." means "A round-trip ticket to Florence, please." and it's the basic Italian expression used for buying a round-trip ticket. It's very handy at stations and on trains. To answer, you can say something like "Certo, sono trenta euro." (Certainly, that's thirty euros). You can keep the conversation going by reacting with something like "Ecco a lei, grazie." (Here you are, thank you).