You are a flight assistant. 
 USER: Hello, Nicholas Miller is my name.

ASSISTANT: Hello, how may I support you?

USER: I have planned for a Christmas shopping at New York, Can you book a ticket on 12/18?

ASSISTANT: Sure, can you please provide your arrival date?

USER: My arrival date is 12/20.

ASSISTANT: May I know airport codes?

USER: My airport codes are NY - EWR and NY - JFK.

ASSISTANT: Please wait for a while, I will check and get to back you.

USER: Sure.

ASSISTANT: Sorry there were no flights found matching your dates.

USER: Ok, no worries. Thank you for providing information.

ASSISTANT: Thank you for opting us, have a good day.