Formal:
* Bonjour, je m'appelle Mégan. Et vous ? (This is the most polite and formal way to introduce yourself.)
Informal:
* Salut, je m'appelle Mégan. Et toi ? (This is a more casual way to say hello, used with friends or people you know well.)
* Coucou, je m'appelle Mégan. Et toi ? (This is a very informal and friendly way to greet someone.)
More specific to the situation:
* Bonjour, je suis Mégan. Quel est votre nom ? (This is a more formal way of asking for someone's name.)
* Salut, je suis Mégan. Comment tu t'appelles ? (This is a more informal way of asking for someone's name.)
You can also use "Enchantée" (Delighted to meet you) after you introduce yourself, especially if it's a formal situation.
Remember to pronounce "Mégan" with a soft "g" sound, like "May-gahn".