You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to visit Millennium Park at Chicago, could you please help me with booking a flight ticket from IAD to ORD?

ASSISTANT: Sure, kindly share your travel dates.

USER: I would like to depart on June 4th and return on June 6th.

ASSISTANT: Do you have any connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: Is there any other specifications?

USER: Make sure that my depart time must be evening.

ASSISTANT: May I know your name?

USER: I am Carol King.

ASSISTANT: Please wait.

USER: Sure, take your time.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thanks for reaching us.