You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: My name is Richard Edwards. Me and my friends are planning to go for a tour, but it has been postponed, so please change my existing reservation.

ASSISTANT: Sure. Wait a minute. Thanks for waiting.

USER: Ok.

ASSISTANT: There is no reservation found with your name.

USER: No problem, thanks for your help.

ASSISTANT: Thank you.