My Cockatiel has a full range of noises, from Stirring a tea cup every time he hears the kettle boil, to laughing and saying basic things like "good morning", "hiya", "what are you doing". Plus all the other things like telephone rings, whistles and other very annoying noises like the washing machine!!...But they do forget quite easily if they are not encouraged to practice noises and words. Some i stopped encouraging lol he can be quite piercing at times.

Enjoy teaching your cockatiel some quiet noises...Have fun