You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me in reserving the ticket from DEN to ORD?

ASSISTANT: Sure, may I know your trip dates please?

USER: I would like to travel on Dec 1 and again I will return back on Dec 3.

ASSISTANT: Is there any airline preference?

USER: No, I don't have any airline preference.

ASSISTANT: Do you have any specific travel timings?

USER: I want to depart in the afternoon.

ASSISTANT: Would you like any break in between your journey?

USER: I am comfort to travel in direct flight.

ASSISTANT: Do you want to fly in economy class or business class?

USER: No, I comfort to travel in any class.

ASSISTANT: Ok, can you mention your name to proceed further?

USER: Myself Joseph Hall.

ASSISTANT: Sorry, no flights found as per your requirement.

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

ASSISTANT: Thank you for contacting us and have a nice day.