You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I help you?

USER: Due to an emergency, I want to change my existing reservation. Can you help me with the process of changing?

ASSISTANT: Sure, I am blissful to help you. To proceed further, May I know your name please?

USER: I am Kevin Lee.

ASSISTANT: Ok, wait a while.

USER: Sure.

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. Thanks for your quick response.

ASSISTANT: Thank you, Have a great day.