You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I am Michael Brown. I want to cancel my reservation, due to my health issues. So please help me in the cancellation.

ASSISTANT: Sure, I will help you with that. 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.

ASSISTANT: Thank you for reaching us.