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If you know the person well :

                   Comment t'appelles tu ?

If you do not know the other person well enough or at business:

                    Comment vous-appellez vous ?

Bonjour !
Hello! (formal)
Salut !
Hello! (informal)
Comment vous appelez-vous ?
What's your name?
Je m’appelle Paul.
I'm called Paul.
D’où venez vous ?
Where do you come from?
Je viens des Etats-Unis.
I come from the United States.
Vous parlez bien français.
You speak French well.
what is your name?
Comment t'appelles-tu?