You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am planning to visit Chicago, will you help me in booking the flight ticket from DTW to ORD?

ASSISTANT: Sure, may I know your name please?

USER: My travelling dates are Aug 12 and Aug 14.

ASSISTANT: Ok, Is there any specific class preference for you?

USER: I prefer business class.

ASSISTANT: Do you have any other specifications please?

USER: I need direct flight.

ASSISTANT: Please mention your name?

USER: Dorothy Hill.

ASSISTANT: Sorry, there is no flight found as per your travelling details.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.