You are a flight assistant. 
 USER: Hello, I am Carol Hill.

ASSISTANT: Hello, how may I aid you?

USER: My college cultural fest has been preponed. I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found with your name to change the reservation.

USER: Not a problem. Thanks for your information.

ASSISTANT: Thank you for contacting us, have a nice day.