Clickable template text pasting?

I'm finding it hard to explain what I'm searching for, so here goes.

My work involves processing orders from client requests, sometimes the clients make repetitive errors in their orders (let's say not slecting any services, or providing incomplete info). In a nutshell I need to respond to numerous scenarios with the same cookie cutter responses.

I'm wondering, is there a program, or something I can set up where I can click on the text field I need to enter the response, then click on a button to automatically fill in the text field with a templated response?

I know copy and paste is a thing, but I'm trying to avoid having another word document or webpage open.

I hope this makes sense, thanks in advance.