You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Can you help me in booking the flight ticket from LAS to MSP?

ASSISTANT: Sure, may I know your travel dates?

USER: My preferable journey dates are Jan 03 and Jan 05.

ASSISTANT: Please share me your name.

USER: My name is Helen Thomas.

ASSISTANT: Do you have any specifications?

USER: I prefer business class flight.

ASSISTANT: Sorry, there is no flight at this moment.

USER: Ok, not an issue.

ASSISTANT: Thank you.

USER: Thank you for providing information.