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

ASSISTANT: Hello, how can I assist you today?

USER: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: Sure, I can help you better.

USER: Thank you.

ASSISTANT: Please wait, I will go through your reservation and update you.

USER: Sure.

ASSISTANT: Thanks for waiting, we did not find any reservation on your name to change.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thanks for consulting us, have a nice day.