You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I am planning to meet my colleagues at Denver. Can you please help me in reserving the ticket from EWR to DEN?

ASSISTANT: Sure, can you please forward your journey dates?

USER: I am willing to take-off Mar 23 and again I will return back on Mar 25.

ASSISTANT: Do you have any class preference?

USER: My class preference is business.

ASSISTANT: Please mention your connection limit.

USER: I am flexible with single connection.

ASSISTANT: Is there any more specifications?

USER: No, I don't have any other specifications regarding my journey.

ASSISTANT: May I know your name please?

USER: Myself Anna Brown.

ASSISTANT: Sorry we did not find any flights matching your requirements.

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

ASSISTANT: Thank you for choosing us.