I heard this exchange on NPR this morning and looked around for a transcript. Found it at AAR:

WH aide: “Capt. Kennedy are you ready?”
Kennedy: “I am ready, ma’am.”
WH aide: “Okay, this is for the money. We are going to time this and remember that if the President cut’s it short, if he asks more questions, if you have the microphone and he follows up with a question to you, no matter who has it, Captain Pratt if you have the microphone and the President hears something and he wants more information, you just keep that microphone and talk to the President.”
Kennedy: “Okay.”
WH aide: “But if he gives us a question that is not something that we have scripted Captain Kennedy you are going to have the mic and that’s your chance to impress us all.”
Kennedy: “Okay.”
WH aide: “Which won’t be a problem for you.”

Chalk up another misstep in recent days for this administration, and another little prevarication on the part of the White House press secretary.