Cancel a Showing for Caller #1 if Someone Else Qualifies First?

[Jen Faulkner]

I've been a landlord for seven years, but I'm just curious about what the rest of you do.  I always feel a little uncomfortable in this case.  Okay, let's say today is Tuesday.  You talk to Person #1 on the phone, pre-screen them on Facebook (haha, yes I do!) before you ever meet them, and you're pretty sure they're a good fit for the rental, but they can't see the rental until Saturday because they're so far away.  However, Person #2 calls and looks at the rental on Wednesday.  They fill out an application, and they are a perfect fit also.  Do you still "play fair" and wait the three more days to show it to Person #1?  I don't usually run into this problem because we will show it to several people on the same day, so we have several applications to look over at the same time.  But in this case, I wonder if I'm a bad guy if I cancel with Person #1.  I know there's a risk of "losing" one or both if there is too much of a delay, but since Person #1 made the appointment first, is there a best answer to this?  What does everyone do?