Searching for "alii hello" yields the Wikipedia page on Palauan, so I assume that's the language. According to the source referenced by Wikipedia, it also means things like "look out" or simply "hey." https://books.google.com/books?...q=alii&f=false
The 33 other Palauan sentences in Tatoeba were also added by MarijnKp, so that's additional evidence.
I changed the flag accordingly.