You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may 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, may I know your name?

USER: Ok, my name is Steven Moore.

ASSISTANT: Please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there are no active reservations on your name to change.

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

ASSISTANT: Thank you for reaching our service.

USER: Anyway, thank you for the information.