You are a flight assistant. 
 USER: Hello, Susan Johnson here.

ASSISTANT: Hello.

USER: I want to cancel my reservation due to my exams have postponed, can you please help me?

ASSISTANT: Susan, what you are looking for? Sure, wait a moment please.

USER: Ok.

ASSISTANT: Sorry Susan Johnson, there is no reservation found on your name.

USER: No issues, thank you for your help.

ASSISTANT: Thank you for your positive response.