You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Amanda Williams, I want to change my reservation as my plan to visit New York city to spend my vacation is postponed.

ASSISTANT: Sure, we are here to help you. Please hold a moment.

USER: Sure.

ASSISTANT: Thank you for your valuable time, sorry, no reservation found with your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for availing us.