I'll stop by this evening for a chat.

今晚我想过去聊聊。

I want a bit of a chat.

我想稍微聊聊。

Squatting down, the two of them started to have a chat.

两人蹲下就聊起来了。

I just called in for a chat.

我只是来聊聊天。

I was just phoning up for a chat.

我只是打电话聊聊天。