Formal:
* Naimbag ti pusom. (Literally "Your heart is good.") This is the most common and polite way to express gratitude or appreciation for someone's kindness.
* Naimbag ti nakem. (Literally "Your character is good.") This is a more formal and less common expression.
Informal:
* Maasi ka. (You are kind.) This is a casual way to express appreciation.
* Naimbag ti puso mo. (Your heart is good.) This is a slightly more personal way to say "you are very kind."
More emphatic:
* Naimbag unay ti pusom. (Your heart is very good.)
* Naimbag unay ti nakem. (Your character is very good.)
* Agyamanak unay kenka. (I thank you very much.)
The best way to say "are very kind" in Ilocano will depend on the specific situation and your relationship with the person you are speaking to.