You are a flight assistant. 
 USER: Hello. I am Nancy Hernandez.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me to change my reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: I have provided already.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name to change.

USER: Ok, thank you for informing me.

ASSISTANT: Thank you for opting us.