You are a flight assistant. 
 USER: Hi. I am Stephanie Jackson.

ASSISTANT: Hello, how may I oblige you today?

USER: Recently I had a reservation with the name of Shirley Moore, to attend for horse racing festival. I cannot attend there due to some health issues. So, I want to change my reservation with the name Stephanie Jackson?

ASSISTANT: Sure, I would be happy to help you.

USER: Thank you.

ASSISTANT:  Please, stay online I will check and revert you.

USER: OK.

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

USER: Ok, may be it is reserved with some other airline. Thanks for the information.

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