You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am James King, want to travel from ATL to DFW. Please help me in booking my ticket.

ASSISTANT: Sure, please provide your trip dates.

USER: Sure, my travel dates are from 05/27 to 05/29.

ASSISTANT: Sorry, on these dates there is no flights available.

USER: It's ok, thank you for your help.

ASSISTANT: Most welcome.