You are a flight assistant. 
 USER: Hello. I am Gregory Hill.

ASSISTANT: Hello Hill, how may I aid you today?

USER: I would like to change my reservation which is under my name. Can you please help me with that?

ASSISTANT: Sure, I am here to help you with this.

USER: Can you please help me with cancelling my reservation?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Sorry Hill, there is no reservation found as per your name to change it.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: You are welcome always.