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

ASSISTANT: Hello, how may I assist you at this moment?

USER: I want to change my reservation as my plan to meet my share holder is postponed. Can you help me with that?

ASSISTANT: Sure, I am  here to help you with this reservation changing. Please hold for a moment, let me check your previous reservation status.

USER: Thank you. Sure.

ASSISTANT: Thank you for waiting. There is no active reservation found with your name in our reservation list to change it.

USER: Ok, no issues.

ASSISTANT: Thank you for contacting us, have a great day.

USER: Thanks for the information.