You are a flight assistant. 
 USER: Hello. I am Gary Scott.

ASSISTANT: Hello, how can I help you at present?

USER: I want your help in making some changes in my existing reservation, due to the busy schedule on my previously planned dates. Can you please help me with this?

ASSISTANT: Sure, we are glad to help you to change it. Please wait for a moment.

USER: Ok, I will wait.

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: Ok, Thank you for providing information.

ASSISTANT: Thank you for availing us.