You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Deborah Johnson, please help me in changing my existing reservation as my schedule to attend for meeting got postponed.

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no active reservation on your given name.

USER: It's ok, thank you for your information.

ASSISTANT: Thank you for opting us.