You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my existing reservation, my music concert got postponed. Can you please help me out with that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you for accepting my request.

ASSISTANT: May I know your name?

USER: I have reserved it on the name of Matthew Gonzalez.

ASSISTANT: Please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: Oh! I think the ticket was not booked due to server issue. Anyway, thank you for the information.

ASSISTANT: Thanks for reaching us.