You are a flight assistant. 
 USER: Hello, Anna Robinson here.

ASSISTANT: Hello, how may I assist you?

USER: Would you mind helping me in booking a plane ticket to DCA on 08/20?

ASSISTANT: Sure, can you please share your source airport code?

USER: Definitely, I would like to start my journey from MCO location.

ASSISTANT: May I know your return journey date?

USER: Sure, my planned return date is 08/22.

ASSISTANT: Sorry for the inconvenience, there is no flight available on your requested dates.

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

ASSISTANT: Thank you for contacting us.