You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Kathleen Brown here.

ASSISTANT: How should I assist you at this time?

USER: Actually, I have done a booking regarding my exams but the exams got postponed due to heavy rain. Can you please change my existing reservation?

ASSISTANT: Sure, I am happy to help you. Please give me a moment, I will inform you soon.

USER: Yes, sure.

ASSISTANT: Thank you for waiting. Sorry Brown, there is no reservation found under your name. Thank you for choosing us.

USER: Ok, fine. Thank you.

ASSISTANT: You are welcome, have a good day.