You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: My name is Mary Lee, I want to cancel my reservation due to health issues.

ASSISTANT: Sure, we are gleeful to help you for cancellation. Please wait a while.

USER: Sure.

ASSISTANT:  Thank you for waiting. I have checked in reservation list to cancel your ticket, but could not find any reservation with your name.

USER: Not an issue, thank you for your service.

ASSISTANT: Thank you for choosing us.