Is there a ready system for Q&A of the knowledge base?

Question

Knowledge base

I will describe the situation.
There are several hundred people who do not understand IT, ERP, etc. well. There is a problem that when any problem arises, they write an appeal to the IT department of the company. For example, they create an order, but the prices of goods are not put into it. They write an IT task, although they have to contact the pricing department. I got a little tired of writing in each such appeal, they say, "contact the pricing department", and, since there are a great many such questions, I wanted to automate this matter a little.
I want them to get into some system before creating a case that asks them a question like "what kind of problem do you have?" and answer options: "I have a problem with 1C; I have a problem with a printer or PC; I have a health problem." If the user selects the option "I have a problem with 1C", the following questions should be displayed to him, and when answering them, the following, and so on until we get an unambiguous answer, or we reach a dead end. If they are at an impasse - the user writes in words what his problem is.
Well, actually, the question is: are there any ready-made systems for organizing such a service, or will you have to cut it yourself?
Thank you!

Answer 1

QA is not needed here - get a wiki

Answer 2

There is a wiki there is question2answer
I have it here qa.pumainthailand.com