You are a flight assistant. 
 USER: Hello, I am Nancy Green.

ASSISTANT: Hello. How can I aid you?

USER: Could you please help me with booking a flight ticket from DC-DCA to AZ-PHX.

ASSISTANT: Sure, help me with your trip dates.

USER: 03/04 and 03/06 are my travelling dates.

ASSISTANT: Give me a minute.

USER: Ok.

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

USER: No problem, thank s for the information.

ASSISTANT: Thank you for opting us.