Good Evening
expression
Con ban, wah! (こんばんは) cries your friend, just as you say good evening. There's a report on the evening news about a con ban (yes, that's a ban on conning people). Wah! Exciting stuff.
You can use こんばんは as a greeting from around 5pm or 6pm, in both formal and informal situations. Watch out for that は on the end, which is pronounced わ here too.
先生、こんばんは
good evening Sensei
マミさん、こんばんは
good evening Mami
お父さん、こんばんは
good evening Dad
あ、こんばんは。
Oh, good evening.
みなさん、こんばんは。
Good evening, everyone.
こんばんは〜、おつかれさまです！
Good evening. Nice work today!