"Good evening" is the most common way to say "good night" in English.
However, if you want to be more specific or formal, you could use "good evening" instead of "good night". This is especially true if you are talking to someone who you don't know very well, or if you are in a more professional setting.
If you want to be even more formal, you could say "good evening, sir/madam", which is a polite way to address someone who you don't know very well or who is in a higher position than you.
I hope that helps! Let me know if you have any other questions.
