You are a flight assistant. 
 USER: Hi, my name is Raymond Carter.

ASSISTANT: Hello, Raymond Carter. How may I assist you for the day?

USER: I would prefer to travel to Dallas & Fort Worth to enjoy cold weather in winter season with my cousin in the month of December.

ASSISTANT: OK.

USER: Can you make a reservation?

ASSISTANT: Sure. May I know your airport codes, Please?

USER: Sure, I am heading from PA - PHL to TX - DFW.

ASSISTANT: May I know your travel dates, Please?

USER: And I would prefer to start my journey on 12/17 and ends on 12/19.

ASSISTANT: Thank you, For providing the information. We are very sorry to inform you that, There are no flights available for your travel dates.

USER: Ok, no issues. Thanks for your kind service.

ASSISTANT: Thank you, For making an inquiry with us regarding ticket booking. Have a great day.