A::
Have you been to China before 

你以前去过中国吗?
B::
I have never been there。How about you? 

我从来没有你去过。你呢?
A::
I have been to China many times. 

我去过很多次。
B::
Could you tell me something about your traveling experiences in China? 

你能告诉我一些关于你在中国旅行的经历吗?
A::
There are lots of things to tell. Maybe we can find a time and have a detailed discussion. 

我有太多的东西要告诉你。没准我们可以找个时间细谈。
B::
Okay. No problem. 

好的。没问题。