You are a flight assistant. 
 USER: Hello, I am Angela Jackson.

ASSISTANT: Hello, how may I address you today?

USER: Due to some personal work, I want to change my existing reservation.

ASSISTANT: Ok. Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found with your name to change.

USER: Ok, Thank you for providing information.

ASSISTANT: Thanks for opting us, have a nice day.