You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am planning this weekend to visit Washington. Can you please help me in reserving the ticket from DFW to IAD?

ASSISTANT: Sure, I will help you with that. Can I have your travel dates please?

USER: I am willing to drop-off Aug 25 and again I will return back on Aug 27.

ASSISTANT: Ok, please let me know your preferable timings.

USER: I am comfort with any time to depart and return.

ASSISTANT: Do you want any specific class to travel?

USER: My class preference is economy.

ASSISTANT: Are you looking for any breaks in between your journey?

USER: I am flexible with single connection.

ASSISTANT: Can I have your good name please?

USER: Myself Cynthia Martinez.

ASSISTANT: Ok, please wait a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Cynthia Martinez, no flight is available to you on your dates due to some technical issues.

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

ASSISTANT: Thank you for choosing us, have a good day.

USER: You are welcome.