You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I want to visit New York with my sister.Can you please help me out?

ASSISTANT: Sure, I will help you. Can you provide me your travel dates?

USER: The travel dates are from 06/04 to 06/06.

ASSISTANT: May I know your airport codes?

USER: The airport codes are from TX-AUS to NY-JFK.

ASSISTANT: I need your name for booking your ticket.

USER: Sure, my name is Brian Lopez.

ASSISTANT: Thank you, please hold on, let me check for the available flights.

USER: Sure.

ASSISTANT: Sorry Lopez, there are no flights to JFK on 06/04.

USER: Ok, no problem. I will search another flight to complete my trip. Thank you for your information.

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