Formal:
* Maika'i wau, mahalo. (This literally translates to "I am good, thank you.")
* Aloha kākou, maika'i wau. (This means "Hello everyone, I am good.")
Informal:
* Maika'i. (Simply means "good" or "fine")
* Aloha. (This can be used as a greeting or to express gratitude)
It's important to note that the formality of the phrase depends on the context and your relationship with the person you're speaking to.