The HR person called me without warning (i.e. did not set up a time via e-mail, just called). I could not talk at that time, and returned the phone call when I had availability (...the HR person did not answer when I called back). I suggested some dates/times in my message for a discussion, and HR person responded via text for one of the times. The HR person ghosted me, however (i.e. did not call me at the date and time set).