Bonjour, je m’appelle Pierre.
Hello, my name is Pierre.

Salut!
Hello! (casual)

Note: We recommend you use bonjour instead of salut.
Salut is good among youg people but not really proper
for people you just met.

Enchanté!
Nice to meet you!

Comment ça va? (works in every situation)
How are you?

Je vais bien, merci. Et toi?
I am doing well, thank you. And you?

Comment allez vous?
How are you? (formal)

Très bien, merci. Et vous?
Very well, thank you. And you? (formal)

Au revoir.
Goodbye.

A bientôt!
See you soon!