That's a very good question and takes a very intelligent person to ask such a thing. In one way, it sounds as if you're saying "I don't accept your thank you". But the truth is, you want to say how much you do. So the best way of saying it, is "That's ok, it's my pleasure". Not at all means exactly the same thing but you're right to question it.
"Not at all" in my opinion means that what you did was so little it's not worth thanks, when "That's ok, It's my pleasure" means You did something worth thanks, but not more because you were happy to help.
Its all right
It comes from "all right". Someone might ask how you are and you would reply: "I am alright, thank you. How are you?"
No. The correct phrase is "the pleasure is all mine", but this is not an appropriate response to "thank you". "The pleasure is all mine" is a polite and gracious response that can be used when the other person indicates pleasure. For example, if someone says, "It was a pleasure talking to you" or "It was a pleasure meeting you", you can respond with "The pleasure was all mine." If someone says "thank you", the traditional response is "You're welcome."
"Thank you, it was so kind of you all to remember me in my this sweet day"
Nosy? Jealous? Hoping for bad news? Don't even reply.
IMPROVED ANSWER:If someone tells you, "I really like you, but, my heart belongs to another." Your reply needs to be, "If you'd like to be friends, that is all we can be, and nothing more than that."If you wish you can tell them, "I thank you for your comment, but, I'm not interested if you belong to someone else."
, Thank you for your e-mail reply and candor. Your application met with favorable remarks from all the judges.
You open all your ports, it isn't dangerous. -------------------------------------------------------------------------- First of all thank you for your quick reply, and how do I open all of my ports?
When someone says they are pining for someone this means their heart aches and they miss that person and that is all they can think of.
You could offer a reticent "OK". But there might be no need to say anything at all. They have already replied to something, perhaps to an apology. If you keep replying to a reply, it could go on forever! If someone says "That's all right.", just acknowledge it gracefully, with a little 'sad but grateful' smile, and a little nod, maybe. If you DO want to say something, you could repeat your apology! ... and then they will say, "...but it really IS alright. I've forgotten about it already. Don't worry. It's no problem!" At that point you really should stop apologising, and move on!
If the subject means nothing to you, you could relate that. If the subject brings you down by ten percent, you could reply that you are decimated. If the subject wipes you out, you could reply that you are devastated. In other words, you could reply appropriately, inappropriately, or not at all.
She seems to love them loads she always says "Thank you to all my fans!"