I want to ask question to user, question will be response from action

Let say, I want to fetch 4 entities from user. A,B,C and D. Now, A & B are mandatory fields, and user is only providing C & D. So, here my action will return response in which it will fill the slots and also, it will return one string, which I want to display as a question, so it can seen by user like “Please provide the value for A & B”. Let me know If anyone has any kind of knowledge on this.

You can do this with a form