You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER:  Owing to an emergency, I want to change my reservation. Can you please help me with that?

ASSISTANT: Sure,may I know your good name?

USER: Kathleen Carter here.

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 choosing us.