You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Gary Campbell. Please book a flight ticket from JFK to IAD.

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My travelling dates are 05/06 and 05/08.

ASSISTANT: Sorry, there is no flight available on your requested dates.

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

ASSISTANT: You are welcome.