You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nicole Lopez from Washington.

ASSISTANT: How may I assist you?

USER: I am a research student and would like to do research on ancient monuments at Chicago. Can you help me in booking a ticket from IAD to ORD?

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

USER: My preferred journey dates are 07/25 and 07/27.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: Nicole, no flights has been found on your journey dates.

USER: Its ok, thank you for the information.

ASSISTANT: Thank you for choosing us.