You just need a little experience learning to control communication.
So let's look at people who don't stop talking. You need to stop them and regain control. Not difficult. Phrases like: I got it, I agree with you… Use words and phrases that do not encourage continued talking. Example: If you are talking to someone and they look at you and say "I got it", you will typically pause for a moment or stop talking. When the customer pauses talking for a split second take back control by asking another question. Some words/phrases are stronger than others. Use what is appropriate.
Using words are important to keep people talking as well. At times you need to find out the real reason for something. If you keep them talking you will frequently discover the truth of what is really bothering them. Use words/phrases like: go on, what else… Words like these keep people talking naturally.