You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

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

ASSISTANT: Sure, please can I know your name?

USER: My name name is Nancy Collins.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry Nancy, there is no active reservation found under your name in our records.

USER: Thank you for informing me.

ASSISTANT: Most welcome.