Formal:
* Olá, meu nome é Emily. E o seu? (Formal, polite)
Informal:
* Oi, meu nome é Emily. E o seu? (Informal, more casual)
Breakdown:
* Olá/Oi: Hello (formal/informal)
* Meu nome é: My name is
* Emily: Emily
* E o seu?: And yours?
Important Note:
* Formal: Use "Olá" and "Seu" with strangers, people you don't know well, or in more formal situations.
* Informal: Use "Oi" and "Seu" with friends, family, and people you know well.