You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Myself Rebecca Taylor. I want to travel from DCA to EWR locations, can you please help me in booking a flight ticket?

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

USER: My travelling dates are from 10/02 and 10/04.

ASSISTANT: Sorry for the inconvenience, there is no flight available.

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

ASSISTANT: Most welcome.