You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Myself Edward Jones. I want to attend a friend marriage at Washington. Can you please help me in reserving the ticket from LAS to DCA?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: I am planning my trip on Feb 8, and again I will return back on Feb 10.

ASSISTANT: Do you have any other specifications?

USER: My depart time is afternoon, and again I will return back on evening.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

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

ASSISTANT: Thank you for reaching us.

USER: You are most welcome.