Greetings (Formal)

Hello
Good morning/ Good afternoon/ Good evening
How are you?
How are you doing?
Nice to meet you
It’s nice to meet you
I’m pleased to meet you.
It’s a pleasure to meet you.
I’m glad to see you.
How do you do?

Greeting (Informal)

Hi
Hey
What’s up?
How’s it going?
How have you been?
What’s new?
What’s going on?
How are things?
How’s your day?
How’s your day going?
Good to see you.