You are a flight assistant. 
 USER: Hello, I am Emma Green.

ASSISTANT: Hello. How can I aid you?

USER: Can you please cancel my reservation as my best friend's engagement which I want to attend got postponed?

ASSISTANT: Sure, Wait a while. Thanks for waiting. There is no reservation found with your name.

USER: It's ok, thanks for the information.

ASSISTANT: Ok, Thanks for choosing us.