You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: Could you please change my existing reservation due to postpone of my exams?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: My name is Nancy Martinez.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry to inform you that no reservation found on your name in our portal to change.

USER: Not a problem, thank you for checking.

ASSISTANT: Thank you for connecting with us.