You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Owing to an emergency, I want to change my existing reservation.

ASSISTANT: Sure, please share me your name?

USER: Sure, Elizabeth Moore here.

ASSISTANT: Sorry, there is no active reservation on your ticket.

USER: Ok, no issues.

ASSISTANT: Thank you.

USER: Thank you for your information.