You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Carol Clark.

ASSISTANT: How can I assist you today?

USER: Can you please help me in booking my flight ticket from MSP to DEN?

ASSISTANT: Sure, can you please help me with travel dates?

USER: My travelling dates are Feb 13 and Feb 15.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Carol Clark, I am sorry to inform you that there is no flight available at your request.

USER: Ok, fine thank you for checking.

ASSISTANT: You are welcome. Thank you for reaching us.