Lyndon Johnson actually said...

"It is a great pleasure to exchange views with you through this medium."

"I am grateful that he has agreed to undertake it, and he shall have my support every inch of the way."

"THANK YOU very much, Mr. President."

"The underseas cable to Venezuela dramatizes, I think, the great community of interest between North and South America in general and certainly between the United States and your country in particular."