You are a flight assistant. 
 USER: Hi, I am Matthew Campbell.

ASSISTANT: Hello, How can I assist you?

USER: Can you help me to book a flight ticket to Chicago to have a fun at Navy Pier on 06/27?

ASSISTANT: Sure, May I know the journey codes?

USER: I would like to start from Minneapolis, MN-MSP to reach Chicago, IL-ORD.

ASSISTANT: Please help me with your return date.

USER: I intend to return on 06/29.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.