You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to go for a trip on 12/22 and 12/24 to celebrate christmas.Can you please help me to book my ticket?

ASSISTANT: Sure, May I know journey locations?

USER: My travel codes are DFW to MSP.

ASSISTANT: May I know your name please?

USER: Myself Carolyn smith.

ASSISTANT: Ok, Please wait a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, We are sorry to inform you that there were no flights available with your specifications.

USER: Ok, fine. Thank you.

ASSISTANT: Thank you for choosing us, Have a nice day.