You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, May I know, how can I best assist you now?

USER: Jeffrey Young here.

ASSISTANT: Ok.

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

ASSISTANT: Sure, I will help you with that. Please wait for a minute.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: Not an issue, thank you for your information.

ASSISTANT: Thank you for opting us.