You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be of your assistance?

USER: I am Angela young and I want to book a flight ticket to attend a business trip  at NY-EWR from DC-DCA.

ASSISTANT: Ok, may I know your travelling dates?

USER: My travelling dates are from 01/03 to 01/05.

ASSISTANT: Please wait a moment. Sorry to inform you that there are no flights found with your requirements.

USER: Ok. No issue. Thanks for your service.

ASSISTANT: Thanks for reaching us, have a safe day.