People who don't listen decide how they are going to respond before you even stop talking. Don't be afraid to pause for five or ten seconds to consider, validate, the what the person is saying.
Doing so demonstrates that you listened carefully and that you are giving them the courtesy of a thoughtful reply. If you actually give a thoughtful reply, no one will remember that it took you nine seconds to start talking.
Repeat what the person is saying before you answer.
Never make the mistake of taking five minutes of a
If necessary, allow the other person to clarify what they are saying. Only start your answer when you are 100% certain you understand what the person is saying.
It may seem like a waste of time to do this, but you will be demonstrating your ability to obtain and understand feedback.