You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: Due to my health issue I want to change my existing reservation. Can you please help me? My name is Kimberly Wilson.

ASSISTANT: Ok, please hold for a minute.

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. Sorry, for the inconvenience. There is no reservation found with your name to change the reservation.

USER: Ok, it's not an issue. Thanks for your kind information.

ASSISTANT: Thank you for approaching us, have a pleasant day.