"no," you can try again later or ask them "why not?" often this will shift things and they will be open to the conversation after all. i have found, however, that the answer is usually "yes."
begin the conversation as you would in "real life," or as you would hope to, since it is much easier to keep calm and speak clearly when doing the exercise. speak your truth and tell them how you really feel about what happened. ask questions and wait for the answer.
you may be tempted to discount what is being said because you feel as though you are speaking for the other person. don't let this stand 