You are a flight assistant. 
 USER: Hello, myself Samantha Nelson.

ASSISTANT: Hello, what can I do for you today?

USER: Can you please book me a flight ticket from JFK to DFW?

ASSISTANT: Ok, may I know your planned trip dates please?

USER: Sure, my departure and arrival day are 08/09 and 08/11.

ASSISTANT: Sorry for the inconvenience but there is no flight available as per your request.

USER: That's ok, thank you for the information.

ASSISTANT: You are welcome.