You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, May I know your good name please?

USER: Sure, I am Deborah Nelson.

ASSISTANT: How best I can aid you today?

USER: Due to some health issue, I am unable to travel now. Can you please change my existing reservation?

ASSISTANT: Sure, we are here to help you to change it.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Ok, I will wait.

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

USER: Ok, Thank you for your service.

ASSISTANT: Thank you for reaching us.