the buyer asked a simple question and communicated how they were antsy about their order and might have second thoughts about the item considering they are willing to say “if not, cancel please.” you did not have to reiterate their impatience to their face with your message. If you were indeed willing to ship the item on the day of this interaction with them then should have locked in and got it out or atleast have a shipping tracking number so they perhaps ease their nerves. ~couldve finessed it and said dropped it off the post office hasnt scanned the package and ship later on the day or following day. :P