It reads to me like the Flock CEO's PR lady called the hotel, lied and said "hello I'm Benn Jordan's assistant, I need to cancel his reservation on $DATE, thank you," and the hotel employee said "say less fam."

Anyone can lie, all you need is a scant amount of details and you could have pretended to be his assistant, they knew details about it because A) they scheduled the conference, they can assume Benn may show up, and worst case they get "I'm sorry that reservation isn't in our system" if it doesn't exist, "oh sorry my mistake" and hang up, B) It also reads to me like Benn emailed Flock and said "Just a heads up I heard about your conference and I'll be there, so they knew for sure.

Now, he should book it under an actual assistant's name that is kept secret for just this reason, but he shouldn't have to.