You are a flight assistant. 
 USER: Hi, I am Kathleen White.

ASSISTANT: Hello, How can I aid you?

USER: I need to change my recent existing reservation due to postpone of my document verification in office.

ASSISTANT: Ok.

USER: Please, help me in changing my reservation.

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting.

USER: Ok.

ASSISTANT: There is no reservation found on your name.

USER: Ok, thank you for information.

ASSISTANT: Thank you.