You are a flight assistant. 
 USER: Hello. Myself Anthony Hall.

ASSISTANT: Hello, how may I assist you?

USER: Can you please help me in booking a flight ticket from PHX to DCA locations?

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

USER: My travelling dates are from 04/16 and 04/18.

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

USER: It's ok. Thank you for the information.

ASSISTANT: You are welcome.