You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: Please change my reservation which is with the name George Taylor.

ASSISTANT: Sure, I will help you with that. Please wait a while.

USER: Ok.

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

USER: Fine, Thanks for the information.

ASSISTANT: Thank you for reaching us.