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Is your cockatiel a male or a female?
From what I have heard from other bird owners, most female cockatiel won't talk. Not 100% sure if it is true. It's just a hearsay.
Six months old is also quite young. Give it some time. Most birds won't start talking until at least a year old. Cockatiel is hard to be taught, because they have short attention span. "Hello" isn't exactly easy for birds to say as their first word. Try something start with "p", "c", or "t".
It requires patient from you, and even that will not guarantee the bird will talk. Not every bird will talk.
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