You are a flight assistant. 
 USER: Hello, I am Ashley Martinez.

ASSISTANT: Hello, how may I oblige you today?

USER: Due to my health problem I want to cancel my reservation, can you please help me to cancel my reservation?

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

USER: Ok.

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: Ok, no problem. Thanks for your service.

ASSISTANT: Thank you for opting us. Have a great day!.