If Owen were to tell Daniel something about the date of birth he saw at the back of the paper, there is no doubt he would have to expose himself a bit. Except he gives him a subtle comment and leave the man to imagine things on his own. He couldn't lie that it was someome else's date of birth.
Daniel would ask him who. He might decide to not leave him alone till he spills whose date of birth it is.
"So whose date of birth is that?" Daniel asks, tapping his left leg on the floor.
Owen first clears his throat and stares outside. The place they were seated at has a transparent view of everyone outside. He couldn't tell if people outside could also see them but judging by the way people just walked by without bothering to even look in, he guessed only the people inside could see the ones outside. "If I tell you this, it will be up to you and your imagination. I will not answer any other question again."