The single most important step in verbal communication is to check what part of your message was understood as intended. When you find out what your listener did not understand, you can explain or discuss that part of your message and check it again. You can keep the process going until the listener demonstrates that your complete message has been understood as intended. Make it a practice to check with your production team members to determine what they understand of every message you give them. Often, they do not even know what they do not understand.
People say yes legitimately because they do understand what they do understand.
What you are offering them is a 50 percent chance of making a liar out of themselves unknowingly. It is likely they only understand about 50 percent of the communication. The only way you can find out what part of your message was understood is to have listeners tell you back what they understand. Practice will more than convince you of the benefits. It will make you a better communicator.