You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nicole Moore.

ASSISTANT: How may I assist you?

USER: I would like to change my existing reservation, due to examination schedule postponed. Can you please help me?

ASSISTANT: Sure, I am here to help you with that.

USER: Sure, thank you.

ASSISTANT: Wait a moment please, let me check with that. Nicole Moore, we regret to inform you that there is no reservation found on your name in our records.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for choosing us.