You are a flight assistant. 
 USER: Hi, I am Anthony Walker.

ASSISTANT: Hello, how can I aid you?

USER: Due to postponed of my interview, so I want to change my existing reservation.

ASSISTANT: Ok.

USER: Can you please guide me with this?

ASSISTANT: Sure, please wait a moment.

USER: Ok, I will wait.

ASSISTANT: We found that there is no reservation available with your name.

USER: Ok, no issue. Thanks for your prompt response.

ASSISTANT: Thank you for approaching us.