Formal:
* "Tena koe, kia ora koe." This translates to "Greetings to you, may you be well." It's a polite and respectful way to express well wishes.
* "Kei te tumanako ahau kia pai koe." This translates to "I hope you are well." This is a more direct way of expressing well wishes, but still formal.
Informal:
* "Kia ora!" This is a general greeting that also conveys well wishes. It translates to "May you be well."
* "Mauru ora." This is a more casual way to say "I wish you well."
* "Arohanui." This translates to "Much love" and is a very affectionate way to wish someone well.
The best option for you will depend on your relationship with the person you are speaking to and the situation.