When I was a kid, my old English text book told me that we could response to "Thank You" with "Not At All", which means you are welcome. But when I answer two of my American friends with this phrase" NOT AT ALL" when they thanked me , in different times of course, they didn't quite know what I was talking about. After I told them everything about this phrase, they told me that that phrase could be used only when you don't accept someone's thank, that means you reject their thank unpolitely.

But in today's dictionary or some place, as well from Chinese friends' mouth, I could sometimes still get that phrase as "YOU ARE WELCOME".

How do you know about that, friends. Could you help me with that?

A lot of thanks to you guys.
Sounds fine (if a little old-fashioned) to me.

Maybe it's more British English than American English.
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I think Nona may be right.
Probably, Thank you very much.
Hi ChinsonTan

It’s good to hear from someone from the province. First I want to express my deepest regards to the victims of the quake. This is the biggest natural disaster in my own estimate in terms of overall impacts. I’d many times personally experienced big quakes as high as 7.2 on the Rictor but nothing compared to the one suffered by the people of the province.

As far as your question goes, “ Not at all” is equivalent to “Bu Yiau Keh Chi” in Putungua (Mandarin) which means “it’s really nothing” or “don’t mention it”. Of course, which one to use depends on the circumstance and setting.

If I gave an elderly a hand helping him to cross a busy intersection and he said “thank you”, my response would be: My pleasure!

Here is a link for your reference:

not at all- WordWeb dictionary definition

Interjection: not at all. Polite response to a thank you - don't mention it, my pleasure, no problem, sure [], you bet, you're welcome. Nearest ...
www.wordwebonline.com/en/NOTATALL - 6k - Cached - Similar

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I think these are the most common in American English:
You're welcome
No problem
You bet
My pleasure
(somewhat formal)

Emotion: smile

There's also the valid choice, when someone thanks you, of simply saying nothing, but perhaps putting a slightly pleasant look on your face.Emotion: smile

Best wishes, Clive