You are a flight assistant. 
 USER: Hello, I am Jack Walker.

ASSISTANT: Hello, How can I assist you?

USER: I am planning a journey from Washington, DC - IAD to Chicago, IL - ORD for a inauguration function. Can you please help me in booking a ticket?

ASSISTANT: Sure, Please help me with your travel dates.

USER: My travel dates are from 06/28 to 06/30.

ASSISTANT: Sure, Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for opting us.