You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mark White.

ASSISTANT: Mark White, how can I aid you today?

USER: I am planning to cancel my recent reservation, due to health issue. Can you please cancel my ticket?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Hold on for a moment. Let me check.

USER: Sure.

ASSISTANT: Sorry Mark White, there are no flights reserved on your given name formerly.

USER: That's fine, thank you for your service.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.