Say what?

I just scheduled our annual dermatology appointments. First available date? My birthday, which is several months from today.

After 15 minutes of trying to find a date with two back-to-back times available, the poor scheduler couldn't find my husband's name in the system. I suggested she try flipping two letters in our last name (a very, very common error). She found an entry, but the individual's first name was my husband's middle name. She asked what his birth date was, and I told her. Her response? "There's no way this can be him, this person's birthday is [same month, two days earlier, same year]."

Clerical error(s) or just a weird coincidence? Seriously, what are the chances that someone has a name and birthday so close to my husband and is a patient at our small clinic?