You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planning my trip to travel Washington. Can you please help me in reserving the ticket from DCA to IAD?

ASSISTANT: Can I know your journey dates?

USER: I would like to travel on Oct 4 and again I will return back on Oct 6.

ASSISTANT: Do you have any class preference?

USER: I am comfort to travel in any class.

ASSISTANT: Is there any other requirement?

USER: I want to travel in direct flight.

ASSISTANT: Please let me know your name?

USER: Myself Timothy Harris.

ASSISTANT: Sorry, currently there is no flight for your travelling dates.

USER: Not a big deal, anyhow thank you very much for your kind information.

ASSISTANT: Thank you. Have a nice day!.