你是王经理啊，你好你好！

Hello, Mr. Wang, how do you do?

嗨, 王先生, 你好吗?

英文称呼别人不会把经理说出来的.

so you are Mr Wang, nice talking to you

You must be Mr.Wang,how are you doing?

Is there Mr.wang speaking?

地道的说法：
Hello! Is that Manager Wang?

So you are Mr. Wang. Nice to meet you.

2楼基本正确，但nice talking to you一般用于告别时

在电话中，常用this is 和 that is 来表示。
上句这样说：Hello,that is Mr.Wang.