What's going on?

Good morning!

How's everything?

What's up?

How do you do?

Hello!

How are you?

Good afternoon!

How are you doing?

Let me introduce you to....

May I introduce you to....

This is my friend....

Nice to meet you...

Pleased to meet you....

Nice to meet you, too...

Goodbye!

I hope to see you soon!

Bye!

See you later!

Take care

Have a nice day.