Formal:
* Bonjour, comment allez-vous ? Je m'appelle Savannah. (This is the most formal way to say it. It's appropriate for professional settings or when meeting someone for the first time.)
Informal:
* Salut, comment vas-tu ? Je m'appelle Savannah. (This is more casual and friendly. It's appropriate for friends, family, and people you know well.)
* Coucou, comment ça va ? Je m'appelle Savannah. (This is very informal and often used between close friends or family.)
Even more casual:
* Salut, ça va ? Je suis Savannah. (This is very informal and can be used between good friends or people you know well.)
Important Note: In French, it's customary to greet someone first and then ask how they are before introducing yourself.