Make sure to use body language as well
Verbal communication is important but communication must not be limited to talking alone. You need to relay your information through other ways such as body language, behavior, and facial expressions. And, you also need to be prepared to help them by accommodating to their needs from time to time. When they are trying to talk about something, you can help them establish their thoughts and guide them to construct their words. Your tone must also be modulated so that they would not feel alarmed. Even if you are frustrated, you need to compose yourself and talk to them in the most supportive way.