You are a flight assistant. 
 USER: Hello, Thomas Baker here.

ASSISTANT: Hello Thomas, how can I assist you?

USER: There is sudden change in my trip to New York, so I want to cancel my reservation.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Thank you for waiting Thomas, there is no reservation found on your name.

USER: It's fine, thanks for helping me.

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