You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Ryan Wright, I want to book a flight ticket to LAS from JFK.

ASSISTANT: Sure, can I know your travel dates?

USER: Yes, my travelling dates are 04/09 and 04/11.

ASSISTANT: Please give me a minute.

USER: Ok.

ASSISTANT: Ryan, there is no flight available on your request.

USER: Not a problem, anyway thank you for the information.

ASSISTANT: You are welcome.