You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Please book a flight ticket from ORD to MSP?

ASSISTANT: Sure, please provide your travelling dates.

USER: My journey dates are Feb 20 and Feb 22.

ASSISTANT: Ok, Do you have any class preference?

USER: No.

ASSISTANT: Ok, May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Ok, Is there any other preferences?

USER: No.

ASSISTANT: Thank you for providing details, we did not find any flights with your given details.

USER: No problem, thank you for your information.

ASSISTANT: May I know your name?

USER: I am Mary Perez.

ASSISTANT: Thank you for choosing us.