You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you right now?

USER: I am planning to visit Washington, can you please book me a ticket from ORD to DCA?

ASSISTANT: Sure, I am happy to help you and may I know your travelling details?

USER: My preferable journey dates are Feb 19 and Feb 21.

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

USER: I prefer to travel in economy class flight.

ASSISTANT: May I know your name please?

USER: My name is Joshua Nelson.

ASSISTANT: Give me a moment.

USER: Sure, please ensure that flight departing time is in the morning time.

ASSISTANT: Sure but based on your details I am unable to search for a flight on your requirements.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: You are welcome and thank you for approaching us.