You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you for the day?

USER: Can you help me to book a economy class flight ticket?

ASSISTANT: Sure, I will help you with that. May I know your preferable airport codes?

USER: My airport codes are IAD and PHX.

ASSISTANT: Can you please mention your planned travel dates?

USER: My preferable journey dates are Sept 07 and Sept 09.

ASSISTANT: Which class do your prefer either economy or business?

USER: I have already mentioned above.

ASSISTANT: Do you have any other specifications?

USER: I prefer connecting flight on this route.

ASSISTANT: May I know your name please?

USER: My name is Joshua Lee.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: There are no flights found on this route as per your travel dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us, have a great day.