You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I just want to change my existing reservation, due to my meeting has been postponed. Can you please aid me to change it?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please help me with your name.

USER: Sure, my name is Stephen Anderson.

ASSISTANT: Please allow me a minute.

USER: Sure.

ASSISTANT: Thank you. Stephen Anderson, I am really sorry to inform you that is no booking done on your name.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us. Have a great time.