Greetings

Two friends meeting

Friends often say "Hi" to each other. Then they often ask a general question, such as "How are you?" or "How are things?" or "How's life?"

The reply to this question is normally positive.

"Fine thanks, and you?"

"Fine thanks, what about yourself?"

"Not bad." Or "Can't complain."

source : http://www.english-at-home.com/speaking/english-greetings/