A: Good morning, everyone. Allow me to introducemyself. I'm Li Hua. 

大家早上好。请允许我自我介绍一下，我叫李华。

B: Hi, Li Hua. It's a pleasure to meet you. 

你好，李华。很高兴认识你！ 

第二句：Will you please introduce me to that lady? 

请你把我介绍给那位女士，好吗？ 

A: Excuse me, Miss Wang. Will you please introduce me to that lady? I want to know her. 

打扰一下，王小姐。请你把我介绍给那位女士，好吗？我想认识她。

B: No problem. She is my sister. 

没问题，她是我妹妹。

其他表达法： 

May I ask your name? 

请问你叫什么名字？ 

I think this is the first time we've met，isn't it? 

我想这是我们次见面吧？