You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to cancel my reservation which is done rcently due to some health issues, can you please help me?

ASSISTANT: Sure, may I know your name?

USER: Ok, my name is Gary Walker.

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

USER: Ok, that's fine. Anyways, thank you for your service.

ASSISTANT: Welcome.