You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Charles Carter.

ASSISTANT: How can I assist you today?

USER:  I have to book a flight ticket  that I am unable to do, could you please help me in booking flight ticket from Chicago, IL-ORD to Detroit, MI-DTW?

ASSISTANT: Sure, will you mention your travelling dates please?

USER:   My travelling dates are 03/05 and 03/07.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

USER: Ok, no problem.

ASSISTANT: Thanks for reaching us, have a great day.

USER: Thank you for the response.