You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I support you today?

USER: I would like to book a flight ticket to attend Colleague's Ring Ceremony in Washington, DC - IAD. Can you book a flight ticket?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travelling dates are 10/12 - 10/14.

ASSISTANT: May I know your good name?

USER: I am Rebecca Wright.

ASSISTANT: Please share your source point.

USER: I will fly from Philadelphia, PA - PHL.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Thank you.

ASSISTANT: Thank you for opting us.