You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Patrick Wright.

ASSISTANT: How can I assist you Mr. Patrick Wright?

USER: I want to travel from MSP to LAS for Business trip, could you please book a flight ticket?

ASSISTANT: Sure, I can help you with that. Based on your requested location there is flight available on 01/28. Would you like to travel on that date?

USER: But my preferable dates are 01/29 and 01/31.

ASSISTANT: OK, let me check whether the flight is available or not on that date.

USER: OK.

ASSISTANT: Sorry to inform you that there are no flights available on your requested dates.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us. Have a nice day.