You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I serve you?

USER: Recently I had a reservation with the name of Christopher Hernandez, to attend for horse racing festival. I cannot attend there due to some health issues. Can you help me to cancel my recent reservation?

ASSISTANT: Sure, I will help you with that. Ok, please wait a moment.

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: Ok, not an issue. Thank you for your great response.

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