To sound more natural try using these in informal situations. 
Yo
Hiya
Whatsup?
Howdy
Hey hey

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Everyday English with Teacher Alyse

How to Say Hello Like a Native Speaker

这是中国家喻户晓的动画片《小猪佩奇》，欢迎大朋友们给小朋友们收听学习中文。动画片也是很好的学习方式。 This is the Chinese family's vocnator's cartoon"Pig Patchewan",welcome friends to listen to learning Chinese to children.Carton is also a very good way to learn. New words: 1.小猪 piggy xiǎozhū 2.佩奇 page pèiqí 3.爸爸 dad bàba 4.妈妈 mom māma 5.出去玩 go out to play chūqùwán