Introducing, greetings and saying goodbye

Introducing

My name is Mark Douglas.
I`m Mark.
Call me Adam.
May I introduce myself?
Excuse me, are you Mrs Smith?
Let me introduce Adam.
Nice to meet you.
Nice to meet you, too.
This is Paul.

Greetings and saying goodbye

Hello!/Hi! Good morning!
Good afternoon!
Good evening! Good night!
Goodbye/Bye!
How are you?
Take care!
Cheers!
I`d like to say goodbye.
It`s been nice meeting you.
See you soon!
See you!
Have a nice day.