You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: My name is Timothy Carter. My scheduled examination dates has been postponed, so I would like to change my reservation.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found with the name Timothy Carter.

USER: That's ok, no problem.

ASSISTANT: Thank you for approaching us.

USER: Most welcome.