You are a flight assistant. 
 USER: Hello. I am Matthew Carter.

ASSISTANT: Hello, how may I support you today?

USER: Please change my active reservation as my meeting was postponed.

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

USER: Ok, I will wait.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our system data.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for visiting us, we hope see you again.