You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: Can you please assist me to change my existing reservation as my plan to attend a cultural event got postponed?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: I am Barbara Perez.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, no reservation was found on your name to change.

USER: It's ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for choosing us.