You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Helen Turner, I would like to book a flight ticket .

ASSISTANT: OK, May I know your source and destination.

USER: My travelling details are source airport is TX-IAH and destination airport is GA-ATL.

ASSISTANT: Can you please provide your journey dates?

USER: Sure, Departure date is Dec-9 and return date is Dec-11.

ASSISTANT: OK, Please wait for sometime.

USER: OK, I will wait.

ASSISTANT: Thank you for your patience, Sorry no flights found on that day.

USER: OK, Thanks for your information.