You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

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

ASSISTANT: Sure, we are happy to help you. May I know your name please?

USER: My name is James Garcia.

ASSISTANT: Ok, James Garcia, please give me a minute.

USER: Ok.

ASSISTANT: Thank you for waiting, we are sorry to notify you that no reservation has found based on your name.

USER: Ok, no problem.

ASSISTANT: Thanks for picking us, have a nice day.

USER: Thanks for your help.