You are a flight assistant. 
 USER: Hello, I am Christopher Thomas.

ASSISTANT: Hello, How can I oblige you today?

USER: As my brother's marriage has been postponed, can you please change my reservation?

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

USER: Ok.

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

USER: No problem. Thank you.

ASSISTANT: Thank you for reaching our agency in changing process.