You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Benjamin Miller.

ASSISTANT: Miller, how can I help you?

USER: I want to attend my sister marriage, I would like to book a ticket.

ASSISTANT: Could you provide your travel dates?

USER: My trip dates are from 12/26 to 12/28.

ASSISTANT: May I know your airport codes?

USER: My airport codes are from ORD to DCA.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, no flight's found as per your requirements.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for reaching us.