am not ilocano..but am sure it is "NAIMBAG NGA RABII"
"naimbag" is good of fine
"rabii" is night
"Magandang gabi" you could also say "Magandang gabi po", "po" was included to show respect. For example "Magandang gabi sa'yo" (Good evening to you) or "Magandang gabi po sa inyo" (Good evening to you).
Magandang gabi! ("Good evening" in Filipino)
Thank you is "Salamat" in Tagalog, Hiligaynon, Cebuano, and Waray (the Leyte-Samar dialect). Good evening is "Magandang gabi" in Tagalog; "Maayong gab-i" in Hiligaynon (Ilonggo); "Maayong gabi-i" in Cebuano; and "Maupay nga gab-i" in Waray (Leyte-Samar dialect).
To say good night in Tagalog, you can say "Magandang gabi."
Tagalog translation of goodnight and good morning: magandang gabi and magandang umaga
magandang gabi
In Tagbanua dialect, you can say "Magandang umaga."
In Manobo, you can say "Magandang Gabi."
"Magandang gabi" is "good evening" in Ifugao.
"Magandang umaga."
marhay na hapon
Magandang araw. You can also say: Good morning - Magandang umaga. Good afternoon - Magandang hapon. Good evening - Magandang gabi.