You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I have planned to go for AUS but I need to change my reservation, so can you please change my existing reservation?

ASSISTANT: Sure, could you please share me with your name?

USER: Myself Paul Thompson.

ASSISTANT: Ok, please wait for a mean while.

USER: Ok.

ASSISTANT: Sorry Thompson, there is no reservation found as per your name to change your reservation.

USER: Ok, fine thank you for informing that information.

ASSISTANT: You are welcome always.