You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I need to change my reservation which I have done to participate in dance event but unfortunately dance event got postponed to next month, can you please change my reservation?

ASSISTANT: I am so sorry that you could not attend your dance event, may I know your name to  check your booking status?

USER: Sure, my name is Stephen Miller.

ASSISTANT: Ok, give me a moment please.

USER: Ok.

ASSISTANT: I could not a find any reservation by your name Stephen Miller, sorry for the inconvenience.

USER: Oh! it's ok  no problem. Thank you for your information.

ASSISTANT: Thank you for choosing our agency, keep reaching us for your further bookings. Have a nice day.