You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I would like to change my existing reservation owing to an emergency.

ASSISTANT: Sure, may I know your good name?

USER: I am Kevin Edwards.

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

USER: Thank you.

ASSISTANT: Thank you for opting us.