You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you today?

USER: Steven Campbell here. I want to attend a Marriage in Detroit. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, we are gleeful to help you. When are you willing to travel?

USER: My travelling dates are 08/04 and 08/06.

ASSISTANT: Please let me know your source airport code.

USER: My airport codes are DCA and DTW.

ASSISTANT: Is there any connection limit for you?

USER: I want to return on afternoon.

ASSISTANT: Do you have specific depart and arrival timings for this trip?

USER: I want to return on afternoon.

ASSISTANT: Can you please help me with your class preference?

USER: I am comfortable with any class.

ASSISTANT: Sorry no flights are available on your journey routes.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.