is there a oral saying to answer "thank u"
The official answer is " u are welcome" ，but I think it is too rigid. Is there a vivid answer?
By the way,I want to know when I could say"never mind" and "no thanks" .If someone says "sorry" to me what should I reply.I just want a native saying.
Thank u very much to responde my question.

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Answer

Hi there! 
It looks too rigid but we use "You are welcome" or "You're welcome" for short answer.
About "sorry" I usually answer with "No problem" or "Don't worry"
Finally, "No thanks" is used as a polite way to say "No" and "Never mind" can be used as "Forget it" or "I didn't say anything".
=)