In this, you have way too much time on your hands video, this owner says their cat Tiggy says 'hello' when she is alone and looking for someone in the morning. According to the description, the poster says she thinks it sounds like the cat is 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." We think that's quite a stretch but you can listen for yourself.
(speaking, howling, kitty)