You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Helen Turner.

ASSISTANT: In which way I can aid you today?

USER: I am planning to book a ticket to attend a meeting at DTW. Can you please help me out from IAD?

ASSISTANT: Sure, I will aid you with that. Can you please mention your preferable travel dates?

USER: I am planning to travel on Dec 09 and return back on Dec 11.

ASSISTANT: Do you have any preferences regarding timings of your journey?

USER: My return time should be afternoon.

ASSISTANT: May I know your connection limit for this trip?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any another specifications?

USER: No.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for reaching us.