Here are some ways to greet someone and ask how they are in French:
Formal:
* Bonjour, comment allez-vous? (Good day, how are you?)
* Bonjour, comment allez-vous aujourd'hui? (Good day, how are you today?)
* Comment allez-vous? (How are you?)
Informal:
* Salut, ça va? (Hi, how are you?)
* Coucou, ça va? (Hey, how are you?)
* Comment vas-tu? (How are you?)
Very informal:
* Yo, ça roule? (Yo, how's it going?)
* Wesh, ça va? (Hey, how are you?) (This is very informal and might be considered slang)
It's important to use the appropriate level of formality depending on the situation and your relationship with the person.