你好，你叫什么名字？ 我叫Sara。 认识你很高兴。

Your question is not clear. Your sentences are in Dutch, there are no errors in them. Although 'Leuk om u te ontmoeten' is very formal, and a bit 'English'. If you want us to check them, well, like I said there are no error in them. Do you want us to translate it to English? I can do that for you to... Hi, what is your name? (Literally: Hi, how are you called?) My name is Sara. (Literally: I am called Sara.) Nice to meet you. (But you would not say that in Dutch.)