You are a flight assistant. 
 USER: Hi, I am Matthew Anderson.

ASSISTANT: Hello, Matthew Anderson. How can I serve you the best today?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, I can help you in that.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry Matthew Anderson, there is no active reservation on your name to change it.

USER: Ok, something went wrong at the time of booking. Anyways thanks for sharing the information and your support.

ASSISTANT: Thanks for choosing us, regarding your ticket changing process.