You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Owing to an emergency I had to request for this change reservation.

ASSISTANT: Sure, I am here to help you with that, may I know your good name to proceed further?

USER: I am Stephanie Roberts.

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

USER: Thanks.

ASSISTANT: Thank you for reaching us.