你好ni hao, 再见 zaijian are old fashioned. 最近怎么样？zui jin zen me yang? or 最近忙什么？zui jin mang shen me? = How have you been? or What have been doing? We say 再见（zai jian）less and less. We say 回头见（hui tou jian）or 回见 (hui jian)。 Means See you later