You are a flight assistant. 
 USER: Hello, I am Anthony Allen.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation due to postpone of my interview at Oakland. Can you please help me?

ASSISTANT: Sure, I am here to help you. Please wait for a while.

USER: Sure.

ASSISTANT: There is no reservation found on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for approaching us.