You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I amend you today?

USER: I made a reservation earlier on the name of Anna Thompson, but I am unable to travel due to some health issues, so I need to change my reservation. Could you help me in changing?

ASSISTANT: Sure, I will help you with that. Please wait a while.

USER: Ok, I will wait.

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

USER: Ok, not an issue.

ASSISTANT: Thank you for choosing us.

USER: Thanks for your kind support.

ASSISTANT: Have a blissful day!.