So I've gotten really fed up with Kili screeching and screaming all the time I'm home to be let out (like border-line ready to strangle her). These were not her native screams either but ones she learned from other birds. Mind you I was careful not to reward the screaming but I think she just enjoys it inherently because she feels she is good at it.
She's known how to say hello for a little while but now I decided I had to put it on cue so she could say hello more often than scream. She would not say it if I stood in plain view but if I hid around the corner and said hello, on occasion she would say hello back purely as mimicking. I would immediately click and spring out to give her a big treat. It only took two nights of this before she was saying hello left and right. But whenever I'd say hello from out of sight and she was in cage, she would reply back hello. Now I'm working on getting her to say hello when I'm present but that is harder because I think the #1 reward for saying hello is my presence rather than the treat. She's learning that she can get me to come visit her by talking rather than screeching. This is great cause I'd rather listen to "hello hello" all day long than that annoying screeching. She's gotta get her vocal energy out somehow so better that then screaming.
So today I was out and briefly came into my apartment to get something. As I opened the door and stepped in out of her own volition Kili greeted me "hello!" It was the cutest thing ever. I walked over and gave her attention and talked to her. The next steps will be to get her to say it on cue whenever/wherever and to get "wanna come out" on cue so she can tell me to let her out when she wants out