Hello Rio,
How are you ? How are things?
你好吗?ni hao ma
or
你怎么样?ni zenmeyang
I am (very) good
我很好 wo hen hao
You could also say informally:
你最近忙吗?
ni zuijin mang ma ?
( literally means are you busy recently ?,but means also how are you doing ?)
The answer would be :
还行 hai xing
OR
你还可以说?
ni hai keyi shuo?
挺好的
tinghao de