You are a flight assistant. 
 USER: Hello, I am Anthony Hill.

ASSISTANT: Hello, What can I do for you?

USER: I want to book a ticket to PHL on 10/12, can you help me with reservation?

ASSISTANT: Sure, May I know the source code and return date?

USER: My origin is EWR and return on 10/14.

ASSISTANT: Please wait a moment.

USER: OK.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: No problem.

ASSISTANT: Thank you for opting us.

USER: Thank you.