You are a flight assistant. 
 USER: Hello.

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

USER: I want to travel Houston to meet my colleagues. Can you please help me in reserving the ticket from DCA to IAH?

ASSISTANT: Sure, I am here to help you. May I know your travelling dates, please?

USER: I am willing to drop-off Nov 8 and again I will return back on Nov 10.

ASSISTANT: May i know your connection limit?

USER: I am flexible with single connection.

ASSISTANT: Let me know your class preference.

USER: My class preference is business.

ASSISTANT: Do you have any other specifications?

USER: My return time is afternoon.

ASSISTANT: Provide me your name, please.

USER: Myself John Wilson.

ASSISTANT: Sorry, we did not found any flights running on your routes.

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

ASSISTANT: Thank you for reaching us.

USER: You are welcome.