it's a pleasure

(it is) (one's) pleasure

One was glad to do it and would do it again. A response to "thank you." A: "Thanks for picking up that package for me." B: "Oh, it was my pleasure. Happy I could help." A: "Thank you so much for helping my children, officer." B: "My pleasure, ma'am."
See also: pleasure

it’s a ˈpleasure

used after somebody thanks you for doing something to help them: ‘Thanks for the meal.’ ‘It’s a pleasure.’
See also: pleasure
References in classic literature ?
It's a pleasure to help people who appreciate our efforts.
It's a pleasure to obey a laird; or should be, to the young."
"It's a pleasure to be able to support this celebration of elite South American golf.
"It's a pleasure to be able to support this celebration of elite South American golf, but it's just as rewarding to see the strides that have been made in the game at grassroots level.