You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mary Brown.

ASSISTANT: How may I aid you?

USER: I am planing to book a ticket from DCA to MCO. Can you please help me out to book a ticket for me?

ASSISTANT: Sure, when are you willing to travel?

USER: I would like to travel on Aug 17 and return back on Aug 19.

ASSISTANT: Do you prefer either an economy or business class?

USER: I am ok with any class.

ASSISTANT:  Please let me know if you have any other preferences.

USER: Yes, I am looking for a direct flight.

ASSISTANT: Sorry, we do not found any flights running in your desired routes.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for reaching us.