You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Alexander Hall.

ASSISTANT: Thank you for providing your name.

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

ASSISTANT: Sure, we are here to help you.

USER: Ok.

ASSISTANT: Wait for a while.

USER: Sure.

ASSISTANT: I have gone through all data, there is no reservation found on your name.

USER: No problem, thanks for your service.

ASSISTANT: Thank you for choosing us, have a great day.