You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Due to urgent work, I would like to change my reservation to some other date, can you please help me out with that?

ASSISTANT: May I know your name?

USER: Thank you for accepting my request, I have reserved it on the name of Helen Phillips.

ASSISTANT: No reservation found on your name.

USER: Oh! I think the ticket was not booked due to server issue.

ASSISTANT: Thank you.

USER: Anyway, thank you for the information.