You obviously (I say obviously but from what I've heard...) shouldn't keep asking for a date or a job interview.

Actually that reminds me of something slightly related. It always seems like back in the day guys would ask a girl out like ten times before she finally said yes. I always hear stories from older couples like "he asked me out 20 times before I said yes and we've been happily married for 60 years!" But nowadays persistence is seen as being creepy in dating, although it's kind of still promoted in sales, business, etc.