You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you?

USER: I want to cancel my reservation due to my exam got preponed.

ASSISTANT: Ok, may I know your good name please?

USER: I am Mary Thompson.

ASSISTANT: Please be on hold.

USER: Ok.

ASSISTANT: Sorry to inform you that, there is no reservation found in your name.

USER: No issue.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your response.