You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Can you please help me to change my reservation which was reserved to New York?

ASSISTANT: Ok, please can I know your name to amend?

USER: My name is Elizabeth Brown.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Ok, thank you for waiting. Sorry, there is no reservation been found on your name to amend.

USER: Ok, not a problem. Thank you for informing me.

ASSISTANT: Thank you for choosing our agency.