You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be a help for you?

USER: Last week I have booked a flight ticket to participate in a dance competition but suddenly that competition got postponed, can you please change my existing reservation?

ASSISTANT: Sure, I am gleeful to help you. May I know on what name the ticket is booked with?

USER: The ticket is booked with the name Stephanie Moore.

ASSISTANT: Ok, please give me a moment.

USER: Ok, take your time.

ASSISTANT: Sorry to inform you that there is no active reservation found on your name in our database to change the existing reservation.

USER: It's ok, may be my father has already changed the reservation. I am so thankful for the information.

ASSISTANT: Thank you for contacting us. Have a great day.