This is the French way of saying “with pleasure”.
“Will you be able to help me with this please?”
“Oh mais oui, avec plaisir!”
That’s all the French I know, but the word plaisir triggered a thought about what the great Swami Chinmayananda once said in response to a question.
A devotee asked him why he was unable to be happy.
Pat came Swami C’s reply, “Because you think you are happy, and looking for happiness, but actually all you are looking for is pleasure.”
Pleasure comes from ephemeral things. Happiness or the true state of Ananda is a permanent state, and cannot be linked to material temporary objects.