You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I render you today?

USER: I need to change my reservation due to my planned event got postponed. So please help me with that.

ASSISTANT: Sure, I am here to help you.

USER: Thank you for accepting my request.

ASSISTANT: May I know on whose name the ticket has been reserved formerly?

USER: Sure, myself Benjamin Adams.

ASSISTANT: Ok, hold on for a moment. Let me check.

USER: Sure, take your time.

ASSISTANT: Sorry Benjamin Adams, there are no flights reserved on your name formerly.

USER: Oh! It may not be booked properly due to server issues. Anyway, thank you for your time.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.