Pronouciation which is above me is: "Watashi wa Shani desu." And I don't think we have a good words that we can translate as "Hi" in Japanese.. but probably you can say "Domo" (You can pronounce as"Dough moe.") would be the best to say "Hi" in Japanese.

Ｉｎ addition, "shani" is usualy readed as "シャニ" in Japanese. so "iam shani" is "私はシャニです。" . ( - v - b

" hi iam shani " : hi -> こんにちは。 i am ～ -> 私は～です。 "hi iam shani" -> 私はshaniです。