You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you today?

USER: My name is Donald Walker.

ASSISTANT: Ok.

USER: I want to cancel my reservation due to health issues.

ASSISTANT: Please wait a minute, I will check and revert to you.

USER: Sure.

ASSISTANT: Sorry to inform, there is no reservation found on your given name.

USER: No problem, thank you for your service.

ASSISTANT: Thank you for availing us.