You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: Myself Michelle Allen. I want to book a flight ticket from DCA to EWR, could you please help me?

ASSISTANT: May I know the dates of journey?

USER: My planning dates are 09/15 and 09/17.

ASSISTANT: Sorry, there is no flight found.

USER: It's ok.

ASSISTANT: Thank you.

USER: Thank you for the information.