You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How may I assist you?

USER: I am Patrick Roberts.

ASSISTANT: Ok.

USER: I have a plan to visit Willis Tower at Chicago, please book a flight ticket with a connection.

ASSISTANT: Sure, we are glad to help you. Can you please share your respective airport codes?

USER: Thank you. My source code is MSP and destination code is ORD.

ASSISTANT: Ok, kindly mention your travelling dates.

USER: My travelling dates are from 08/08 to 08/10.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Thanks for waiting, we are sorry to inform you that, no flights are available on your journey routes.

USER: No issues, thanks for the information.

ASSISTANT: Thank you for choosing us.