You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I need to change my existing reservation, as my exams got postponed. Can you please help me out with it?

ASSISTANT: Sure, I am here to help you out.

USER: Thank you for accepting my request.

ASSISTANT: May I know your name to check your previous reservation status?

USER: Myself Margaret Lee.

ASSISTANT: Ok, please give me a moment.

USER: Ok, sure. I will wait for your response.

ASSISTANT: Sorry to inform you that, there is no reservation found on your name in our records.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for reaching us.