You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, may I know your trip dates?

USER: I will start on 01/23 and return on 01/25.

ASSISTANT: Do you have any other requirements?

USER: I need a break in my journey.

ASSISTANT: Can I know your name please?

USER: I am Jeffrey Turner.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: No problem, thank you for the information.

ASSISTANT: My pleasure.