Rough transcript, times (minutes:seconds) based on recording linked above:

09:38 -> Tower: "Air Canada 356, Boston tower, runway 33L, traffic holding on the crossing runway."
09:44 -> AC 356: pilot reads back landing clearance for 33L
10:04 -> Tower: "United 699, runway 27, clear for takeoff."
10:07 -> UA 699: pilot reads back takeoff clearance
10:21 -> Tower: "United 699, we're going to cancel that. Abort the takeoff United 699."
10:27 -> UA 699: "699, we're stopping the takeoff."
10:30 -> Tower: "Are you able to make that turn off to your right United 699?"
10:34 -> UA 699: "Negative. We'll have to take the next one at the intersection. We'll hold short of the runway."
10:38 -> Tower: "OK United 699. Sorry about that."
10:40 -> UA 699: "That's alright."