You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I amend you?

USER: Larry Hill here, due to sudden changes my exams has been postponed.

ASSISTANT: Ok.

USER: Can you please help me to alter my reservation?

ASSISTANT: Sure, give me a minute.

USER: Ok.

ASSISTANT: No reservation found with your name.

USER: Thank you.

ASSISTANT: Thank you for choosing us, have a nice day.