You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Please change my existing reservation, my meeting got postponed.

ASSISTANT: Ok, please can I know your name to proceed?

USER: I am Barbara Thomas.

ASSISTANT: Ok, thank you for waiting. Sorry, there are no reservations been found on your name to change.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you for connecting our agency.