You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I provide assistance for you?

USER: As my plan to attend a seminar got postponed, I need to change my existing reservation.

ASSISTANT: Ok.

USER: Can you please assist me with that?

ASSISTANT: Sure. May I know your name to check the previous reservation?

USER: I am Larry Hall.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

USER: It's ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for contacting us.