You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Donald Perez here, can you please help me in booking the ticket from DFW to ORD? As I'm planning to visit Chicago.

ASSISTANT: Sure, I am mirthful to help you with that booking. May I know your journey dates, please?

USER: Sure, my planned departure and return travel dates are 03/09 and 03/11.

ASSISTANT: Thank you for waiting, but  I am sorry to tell you that there are no flights available in this route as per your travel dates.

USER: Oh! That's ok, thank you for giving the information.

ASSISTANT: Thank you for reaching our agency, have a great day.