You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I would like to attend a meeting at Minneapolis, please help me in booking a ticket from ATL to MSP.

ASSISTANT: Sure, I am here to help you with that. Can I know your journey dates?

USER: My planned journey dates are on Dec 19 and Dec 21.

ASSISTANT: Ok, do you have any other preference?

USER: I would like to depart in the afternoon.

ASSISTANT: Ok, may I know your name for the flight ticket booking purpose?

USER: My name is Benjamin Allen.

ASSISTANT: Please wait for a minute.

USER: Sure, take your time.

ASSISTANT: We are regret to inform you that, there is no flight available based on your travelling dates.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for reaching us.