You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Samuel White. I have to write an exam in Chicago university, so I need a flight ticket from DTW location to ORD location. Can you guide me in that booking?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Thank you and I want to take off on Dec 16th and I will recur back in Dec 18th.

ASSISTANT: Do you have any other specifications?

USER: I need a flight with single limit and it must depart in morning time.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: That's very sad to hear, anyway thank you for your immediate response.

ASSISTANT: Thank you for reaching us.