You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER:  I would like to cancel my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Sure, I will help you. Please help me with your name.

USER: William Robinson.

ASSISTANT: Please allow me a minute.

USER: Ok.

ASSISTANT: William Robinson, I am really sorry to inform you that  there is no booking found on your name to cancel.

USER: Not an issue, thank you for the information.