You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

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

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

USER: Ok.

ASSISTANT: Please wait for a couple of minutes.

USER: Ok.

ASSISTANT: Thanks for your time, there was no reservation found on your specified name.

USER: Not an issue, thank you.

ASSISTANT: Thank you for choosing our service.