Formal:
* Bonjour, je m'appelle Chelsey. (This is the most common and polite way to introduce yourself.)
Informal:
* Salut, je m'appelle Chelsey. (This is more casual and can be used with friends or people you know well.)
* Coucou, je suis Chelsey. (This is very informal and can be used with close friends.)
Other options:
* Enchanté(e), je suis Chelsey. (This is a more formal and elegant way to say "Nice to meet you, I'm Chelsey.")
You can choose the appropriate greeting based on the context and your relationship with the person you are speaking to.