Noise cancellation does nothing for office noise. It is only useful for things like fans, engines, etc. So, any headphones with isolation will do in an office.
As someone who uses noise cancelling headphones (Bose QC35) every day in the office for ~1.5y, I can tell you that yes it re ally help for me.
It won't hide the voices of people's talking but it will mask them somewhat (like if they where more far). It's the only way I'm able to be functional and talk with clients and continue working in an open space..
However Bose mic is catching everything, but that's another problem..
