You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you at this moment?

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

ASSISTANT: Sure, I will help you. Please wait for a moment.

USER: Thank you.

ASSISTANT: May I know your name?

USER: Sure, my name is Michael Smith.

ASSISTANT: Sorry, there is no reservation existing on your name.

USER: Ok, no problem. Thank you for checking out.

ASSISTANT: You are welcome, have a nice day.