You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist at this moment?

USER: I am planning to visit the Riddle room in Minneapolis & St. Paul, MSP. Can you help me to book a flight ticket?

ASSISTANT: Sure, Let me know your connection limit.

USER: Yes, I need a break in my journey.

ASSISTANT: Can you please share your planned journey dates?

USER: My planned journey dates are June 21 and 23.

ASSISTANT: Ok, May I know your boarding point?

USER: I want to board from Denver, DEN.

ASSISTANT: Ok, please share your name.

USER: Sure, Patrick Nelson here.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait, but I prefer to travel in economy class.

ASSISTANT: Sure. Sorry to tell you that, there were no flights found based on your specified details.

USER: Ok, no issues. Thanks for your help.

ASSISTANT: Thank you for opting our service.