Which tenant application do I process first?

[John Hammers]

I have 2 people interested in renting my townhouse. The first person that showed up wants to enter an application with a lease that starts September 1st, another person showed up right after the first person and wants to rent starting August 15th, do I need to process them in the order received or does the person wanting to rent August 15th get the first chance at renting the townhouse?