You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brenda Jones.

ASSISTANT: How may I aid you today?

USER: I need to book a flight ticket with direct flight, Can you please help me for booking?

ASSISTANT: Sure, we are here to help you in booking.

USER: Thank you.

ASSISTANT: On what dates you are interested to travel?

USER: I would like to travel on 09/02 to 09/04.

ASSISTANT: Kindly mention your planned travelling dates to proceed further.

USER: Already mentioned above.

ASSISTANT: May I know your source and destination points?

USER: My source point is IAD to DFW.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, we are unable to provide flight in between your journey routes due to some technical up-gradation at your destination point.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for consulting us.