You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Timothy Moore here.

ASSISTANT: How can I assist you?

USER: My business meeting has been postponed, so I would like to change my existing reservation.

ASSISTANT: Yes, I can help you. Give me a moment.

USER: Ok, I will wait for your reply.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Ok, not an issue.

ASSISTANT: Thank you for contacting our agency.

USER: Thank you for checking.