"OUR PLEASURE"

I hate the saying "it's the least we could do"it sounds like you're saying if there was less that I could have done I would have done it, but still people use this saying a lot, when they are being thanked for something.

That being said

As I mentioned last week, We (we being work) had a meeting cancelled due to a death in the family of the person we were meeting, and we sent her flowers.

I called her today to reschedule and sent her my condolences. She appreciated it, and thanked me for the flowers.

As the conversation was coming to a close and we set up our meeting, she once again thanked me for the flowers, and I said "Our pleasure"