You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Please help me to book a flight ticket from ATL to IAD?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: My journey dates are Dec 7 to Dec 9.

ASSISTANT: Ok, please share your name.

USER: Pamela Moore.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us, have a nice day.