You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I know your name?

USER: I am Donald Clark.

ASSISTANT: Ok, Donald Clark. How can I help you?

USER: I just want to cancel my reservation, due to some health issue.

ASSISTANT: Sure, please wait for a while.

USER: Sure, I will wait for your response.

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

USER: Ok, Thank you for providing information.

ASSISTANT: Thank you for availing us.