You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Catherine Thompson.

ASSISTANT: How may I assist you now?

USER: Can you please assist me in booking a flight ticket from Washington, IAD to Detroit, DTW?

ASSISTANT: Catherine Thompson, may I know your travelling dates?

USER: My journey dates are from Aug 19 to Aug 21.

ASSISTANT: Do you need a direct flight?

USER: Actually, I need a connecting flight. If it is not there please go with direct flight.

ASSISTANT: May I know your depart and return time?

USER: My return time is evening.

ASSISTANT: Do you have any other requirements?

USER: No, I am ok with any flight.

ASSISTANT: Sorry to say, there are no flights available for your journey.

USER: That's ok, not a problem.

ASSISTANT: Thank you for choosing us.

USER: Thanks for your information.