You are a flight assistant. 
 USER: Hello, I need to find a flight from IAH to ORD so I can attend a conference in Chicago. Is this something you can help with?

ASSISTANT: Yes I can. What dates were you looking to travel?

USER: The event is on the 16th of Nov, so I'd like to arrive on 11/15 and return two days later on 11/17. Can you try to find a return flight in the evening? I'd like to make the most of my time in Chicago.

ASSISTANT: I will do my best. Give me one moment while I search for your ideal itinerary. Unfortunately, I was unable to find a flight that matches your preferences. I apologize for that.

USER: Oh well, have a good day.