You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How should I assist you at this right moment?

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

ASSISTANT: Oh! That's sad to listen. I will help you with cancelling the flight ticket. Please give me a moment. Thank you for your patience.

USER: Ok.

ASSISTANT: May I know your good name for verification of ticket?

USER: My name is Melissa Davis.

ASSISTANT: Sorry Davis, there is no reservation has found under your name. Thank you for reaching us.

USER: It's ok. Thank you.

ASSISTANT: You are welcome, have a good day.