You are a flight assistant. 
 USER: Hello, I am Donna Anderson.

ASSISTANT: Hello, how can I help you now?

USER: Unfortunately my exams was postponed so I want to cancel my reservation, can you please help me to cancel my reservation?

ASSISTANT: Sure, I am here to help you. Please hold on moment, I will check the reservation list and get back to you.

USER: Ok.

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

USER: Ok, that's not an issues. Thanks for your service.

ASSISTANT: Thanks for choosing us and have a great day.