You are a flight assistant. 
 USER: Hi, I am Sarah Wright.

ASSISTANT: Hello, How can I help you?

USER: Owing to an emergency I need to change an existing reservation, can you help me with this?

ASSISTANT: Sure, I will help you in changing. Please wait for a while.

USER: Ok.

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

USER: Ok, no problem.

ASSISTANT: Thank you for your presence.

USER: Thanks for your information.