再见 zai jian

再见 = zài-jiàn

It depends on the situations. When you talk with your friend on the phone, people usually say " 就这样啦，拜拜”， which seems like " that's all, (my friend),bye". If you meet someone and say goodbye, you could just say " 再见，下次再聊". The properly translation is ' see you and talk later' or just 'Have a nice day'. I know, it might be hard to understand, but it's just a way to express that we are going to finish the conversation and say goodbye to each other.

再见 (zai 4 jian4) 拜拜 (bai1 bai It's like bye in English. )

再见，拜拜，再会，后会有期