You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Can you please assist me in booking a flight ticket to EWR?

ASSISTANT: Sure. May I know your name?

USER: Myself Donna Martinez.

ASSISTANT: Donna, please provide your travel details.

USER: Sure, Please book from 06/30 to 07/02.

ASSISTANT: Could you provide your source airport code?

USER: My travelling origin code is DCA.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, no flight's found on your mentioned dates.

USER: It's ok. Thank you.

ASSISTANT: Thank you for reaching us.