You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How may I assist you?

USER: I am Benjamin Hernandez. I made a earlier reservation to attend a meeting, due to some problems it got postponed. Can you please change my reservation?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please? Wait a moment please, let me check with your name?

USER: Sure.

ASSISTANT: Benjamin Hernandez, we regret to inform you that there is no reservation found on your name in our records.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for choosing us.