Formal:
* A hui hou: This literally means "until we meet again" but is often used in a more formal or farewell context.
* Eia i keia: This translates to "here until this," implying that they will meet again in the future.
Informal:
* A hui hou kākou: This is a more casual way of saying "until we meet again."
* E ʻike hou kākou: This literally means "we will see each other again."
Ultimately, the best translation depends on the specific context and the level of formality you want to convey.