1st off, Are you staying in Chicago proper or suburbs(North, South, NW, SW, Western)?  
2nd, Are you willing to travel or need outcall to you?
3rd, Do you have a type?
4th, Specific things you might desire during shared time?

Sharing this info in your ISO post will better help you find a provider who fits your needs.  A lady will know if her incall is in your area, or if she goes to your area, guys who might suggest will also know this.  
If you have a type it narrows the search down, so people who fit what you like respond.  Of if there are things you don't like listing those can help you avoid being contacted by types that do not fit your needs.  
If you like feet, or are into fetishes, or like to cruise the islands or like role play or just like the very best GFE experience you can get, a little explanation might also help the ladies and gentlemen more to understand who they should suggest to you.

So maybe fill in some of the blanks and you might get a more detailed response from someone who truly rocks your world on the single night you are in town