You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Donald Baker.

ASSISTANT: How may I assist you today?

USER: My scheduled examination dates has been cancelled, so I would like to cancel my reservation.

ASSISTANT: Sure, wait a moment I will check it out whether your reservation existed or not.

USER: Ok.

ASSISTANT: Sorry Baker, there is no reservation basing on your details.

USER: That's ok. Thank you for the help.

ASSISTANT: You are welcome.