Comey prepared extensively for his conversations with Trump
"Before going to the dinner, Comey practiced Trumps likely questions and his answers with a small group of his most trusted confidants, the associates said, in part to ensure he did not give Trump any ammunition to use against him later.
The director did not take notes during the dinner with the president, but there were times, one associate recalled, when after meeting with Trump, Comey started writing notes as soon as he got into a car, to make sure he could accurately record what was said.
Another associate said the notes of the January dinner conversation contained very nuanced quotes from the president and a high level of detail."
https://www.washingtonpost.com/world/national-security/comey-prepared-extensively-for-his-conversations-with-trump/2017/05/18/e53b1734-3bf1-11e7-a058-ddbb23c75d82_story.html?hpid=hp_hp-top-table-main_trumpcomey-405pm%3Ahomepage%2Fstory&utm_term=.4eaa1a88a5a2