You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid 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, can you please share your name?

USER: Thank you for accepting my request, my name is Ryan Adams.

ASSISTANT: Please wait for a minute.

USER: Sure, take your time.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

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

ASSISTANT: Thank you for reaching us.

USER: Anyway, thank you for the information.