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

ASSISTANT: Hello, how can I assist you?

USER: I want to change my reservation as my meeting got postponed. Can you help me in changing?

ASSISTANT: Sure, I am happy to help you. Please wait for a moment.

USER: ok.

ASSISTANT: Thank you for waiting, we are sorry to say that there is no reservation found on your name.

USER: Its Ok. Thanks for your assistance.

ASSISTANT: Thank you for connecting with us.