Non-PRO Italian to English Art/Literary Cinema, Film, TV, Drama Subtitle

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Andrew: Excuse me, Ms. Versace! You didn't call my name!
Ms. Versace: What is your name, young man? I'm sorry but your not on the list.
Andrew: He promised. Gianni! Could we talk about it.
Gianni Versace: No, Buena Sera.
Antonio: The boy looks good. You don't like him?
Gianni Versace: Not bad. K
Antonio: Why not then?
Gianni Versace: Something in his eyes worries me.
Andrew: Gianni!
Gianni Versace: Areverdeci!
Andrew: Donatella, Donatella... he promised!
...
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'Buena Sera' is a typo in Italian? What it means?