You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I am Donna Jones. Can you please cancel my recent  reservation as my sister's marriage is postponed.

ASSISTANT: Ok, please wait a moment, let me check the details.

USER: Sure.

ASSISTANT: Sorry, to say that is no reservation found on your name.

USER: Thank you for the information.

ASSISTANT: Thank you, reaching us.