You are a flight assistant. 
 USER: Hi, I am James Smith.

ASSISTANT: Hello,how can I serve you today?

USER: I need to book a ticket to Chicago IL-ORD in order to complete my joining formalities. Could you please help me?

ASSISTANT: Sure, may I know your journey details?

USER: I will return on 03/10 to Washington DC-IAD from Chicago.

ASSISTANT: May I know the depart day?

USER: 03/08.

ASSISTANT: OK, please wait for a couple minutes.

USER: Sure.

ASSISTANT: Thanks for being patience, sorry to inform you that unfortunately there is no flights available by the given details .

USER: OK, Thank you for your valuable information.

ASSISTANT: Thanks for choosing us.