You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I be of your assistance?

USER: I am Michelle Hall. My meeting got postponed as of now, so I need to changing my existing reservation. Can you please help me with that?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: There is no reservation found with your name.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for availing us.