Well, this is awkward.

"His name is Jack Harkness. He's about this tall, handsome, brown hair, loves his coffee, and has an ever present smile on his face." He gestures to show Jack's approximate height and then frowns again. "He's not from here, but he knows your Doctor friend quite well and asked me to keep an eye out for you."

Maybe that's not all that helpful, but this whole situation is getting more confusing by the minute.