You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I need your assistance in booking my flight ticket to DCA in the month of February to attend for a seminar about my study. Can you help me in booking my flight ticket from ATL?

ASSISTANT: Sure, I'm here to help you always. Can you please provide your planned travel dates?

USER: Thank you for considering my request. My planned travel dates are Feb 03 and Feb 05.

ASSISTANT: May I know your good name please?

USER: Sure, my name is Thomas Parker.

ASSISTANT: Can I know your class preference please?

USER: I am comfortable with any of the class but I need to reach back to my home town in the morning.

ASSISTANT: Fine, please wait for a while.

USER: Sure, I will be waiting for your response.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates with your given details.

USER: Oh! Not a problem, I will plan my journey with any other resources to complete my journey. Anyways thank you for the information.

ASSISTANT: Thank you for choosing us, have a great day.