Here is what the person who made this video said about their cat:
My cat can say hello. She only does it when she’s looking for you. She does this at least 10 times a day. She does it in the morning when she wants us to get up, in the night when she’s bored and wants us to get up, and when she’s finished eating and wants to know what room we are in.
Here is what I think it sounds like she’s saying:
“Hello, Hello, Hello, I Know Hello, Hello Hello Hello. Hello. I’m Alone, I’m on my own, I’m Alone, I know hello.”