You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. On what way, can I be useful to you?

USER: I am Brandon Johnson.

ASSISTANT: Ok.

USER: As my meeting with my clients has been postponed, help me in changing my reservation.

ASSISTANT: Sure, I am eager to help you in changing. Please be patience, let me check your reservation status.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry Brandon Johnson, we did not find any active reservation on your name to change it.

USER: Its ok, thank you.

ASSISTANT: Thank you for approaching us, regarding your ticket changing process.