Now most people having a dragon speak to them might have freaked out. Some might have run in terror or at the very least been shocked speechless.
Harley was never 'most people' on a average day and after 'crashing' at Red Oak she had already seen enough strange sights to not be surprised and of course it helped immensely that Harley had spent years in Arkham. Which among its many 'oddities' was a talking walking gator man, Killer Croc and a walking pile of living clay, Clayface. To just name a few.
So Harley without missing a beat replied. "Sure hun. Want me to bookmark your place so you can go back to it later before shutting it down?"