Sometimes we may express surprise and joy, as well as showing our thanks.
"Wow! How kind, thank you",
"That's good of you, Cheers",
"I don't know what to say, thanks a lot".
"I am overwhelmed, thank you so much",
"What can I say? You are the best"
"Thank you very much, This present is so nice!",
"Oh, you shouldn't have!"