You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: The event which I am going to attend has been cancelled, please help me in changing my existing reservation.

ASSISTANT: Sure, I am happy to help you with that. Can I have the name on which you reserved earlier?

USER: My name is Edward Anderson.

ASSISTANT: Ok, please wait a moment and I will check reservation status.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry Edward, no reservation found under your name to cancel.

USER: Ok, no issue. Thank you for your information.

ASSISTANT: My pleasure. Thank you for choosing us, have a great day.