You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Please help me to book a flight ticket with direct flight as my meeting purpose.

ASSISTANT: Sure, may I know your airport codes?

USER: I will fly from DTW to ORD.

ASSISTANT: Kindly share your travel dates.

USER: I have planned to travel on Nov 12th and return on Nov 14th.

ASSISTANT: Is there any other requirements do you have?

USER: No.

ASSISTANT: May I know your good name?

USER: Myself Richard Garcia.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there is no flight services available on your required dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.