You are a flight assistant. 
 USER: Hi, I am Anthony King.

ASSISTANT: Hello, How can I help you?

USER: My board meeting was changed to other place, so please check and change my existing reservation.

ASSISTANT:  Ok, Wait a minute.

USER: Ok.

ASSISTANT: Sorry to tell that there is no reservation on your name.

USER: Ok, Thanks for your information.

ASSISTANT:  Thank you for contacting us.