You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I need to book a ticket from ATL to DFW to meet my brother, can you help me?

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

USER: My journey dates are Dec 26 to 28.

ASSISTANT: Ok, may I know your name?

USER: I am Joshua Campbell.

ASSISTANT: Do you have any specification?

USER: My return time is in afternoon.

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

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

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