You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I have to change my flight ticket booking that the event got postponed to another dates, can you please help me?

ASSISTANT: Sure, I am here to help you with that, may I know your good name to proceed further?

USER: Thank you for considering my request and my name is Anna Roberts.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no active reservation on your given name.

USER: Ok, I think it is not booked while I was booking. Thank you for providing the information about my flight ticket.

ASSISTANT: Thank you for opting us.

USER: Welcome.