You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I want to visit New York with my friends.Can you please help me for booking the flight ticket?

ASSISTANT: I am glad to help you, may I know your trip dates?

USER: The trip is of 2 days from 09/21 to 09/23.

ASSISTANT: Can you provide me your airport codes?

USER: The respective airport codes are from PA-PHL to NY-EWR.

ASSISTANT: For booking your ticket, can you provide me your name please?

USER: Sure, my name is Nancy Miller.

ASSISTANT: Nancy, there are no flights available to EWR on 09/21.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us, have a nice day.