You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Eric Young.

ASSISTANT: What service that you are looking from our agency?

USER: Can you help me to book a flight ticket from IAD to IAH?

ASSISTANT: Sure, I am glad to help you with that. Can you please provide your preferable dates of travelling?

USER: My preferable journey dates are Nov 23 and Nov 25.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Is there any specific timings in your departure and arrival?

USER: I would like to return back in the morning time.

ASSISTANT: Any connection limit do you have?

USER: I prefer direct flight.

ASSISTANT: Please be on hold to check the flights.

USER: Sure.

ASSISTANT: We regret to notify that, there are no direct flights available for your journey with your requested preferences.

USER: No problem, thank you for the information.

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