You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you at present?

USER: Due to sudden changes, my exams has been postponed. Can you please help me to change my reservation?

ASSISTANT: Sure, we are glad to help you to change it.

USER: Thank you.

ASSISTANT: Can you please mention your name to check with your reservation?

USER: Matthew Edwards here.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Thanks for waiting, there was no reservation found on your name to change it.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for consulting our service.