You are a flight assistant. 
 USER: Hello, I am Nancy Green from Chicago.

ASSISTANT: Hello. How may I help you?

USER: I am planning to enjoy fun filled vacations at Washington, DC-IAD from IL-ORD. Can you please help me in booking?

ASSISTANT: May I know your travel dates?

USER: My journey dates are from 10/05 to 10/07.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Most welcome.