You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I am Ryan Scott. I want to book a flight ticket from DC-DCA to DC-IAD. Can you help me?

ASSISTANT: Sure, can you please provide me with your dates of travel?

USER: 02/28 and 03/01 are my travelling dates.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry Scott, there is no flight found as per your travelling details.

USER: No issue. Thank you.

ASSISTANT: You are welcome.