When you meet people you say “Good morning” first thing in the morning, “Good afternoon” from about 12.00 till around 17.00 and “Good evening” from then on.
When leaving, you say “Goodbye”.
“Bye” is more informal.
When leaving at night, you say “Goodnight”.
When going to bed you say “Goodnight Follow the dialogue.
Mr Bean meets Mrs Breuer, one of his students, and her husband in the street.
Mr Bean: Good morning, Mrs Breuer.
Mrs Breuer: Good morning, Mr Bean. How are you?
Mr Bean: I’m fine thanks, and you?
Mrs Breuer: Not too bad. Mr Bean, this is my husband Michael, Michael this is Mr Bean my English teacher.
Mr Breuer: Pleased to meet you.
Mr Bean: Pleased to meet you too. Are you from Germany, Mr Breuer?
Mr Breuer: Yes, East Germany, from Dresden. And you, are you from London?
Mr Bean: No, I’m from Derby, but I live in London now.
Mrs Breuer: Well, goodbye Mr Bean, it was nice to see you. Mr Bean: Yes, goodbye