You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I aid you?

USER: I am Frank Carter. I want to modify my reservation due to postpone of my trip dates to New York.

ASSISTANT: Ok. Sure, please wait for a minute.

USER: Sure.

ASSISTANT: There is no reservation found with your name.

USER: Okay, thanks for providing information.

ASSISTANT: Thank you for availing us.