Greeting and Taking leave
A : hi, Good morning.
B : good morning, how are you?
A : im fine. thanks. and you?
B : im good.
A : nice to see you.
B : nice to see you too .
Apologizing
A : im sorry, i didn't come to your party tonight.
B : oh. nevermind. you can come today.
A : thank you.
B : you're welcome
Thanking
A : can i borrow you pen?
B : of course, just take it.
A : thank you very much.
B : you're welcome.