No worries, once you select an Item from the Conditions, the variable option appears in the condition. 

I confirmed the functionality works in my PDI but noticed that it does take a minute or two for the Flow to detect that the variables have been updated.

FYI, in the previous script, there is a semi-colon that should be deleted

if ((candidateFound) && (cityLocation) && (stateLocation) && (startDate)); {