Pop up assistantd wants to use the login keychain

It is there to support the speech function. By default, dictation runs when you press the fn button twice.

If you are having problems quitting the pop-up and get rid of it you should open Spotlight search - Write Activity monitor - open it - after you opened the program on the top click 'Disk" and search for assistantd and or accountsd (pretty much same thing) double click on it and there will be a pop up with its information after you've got that done . Look down IN the pop up window and click quit and force quit.

osx server - What is assistantd? - Ask Different (stackexchange.com)

What Are assistant_service and assistantd, and Why Are They Running on my Mac? (howtogeek.com)