You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you for today?

USER: Can you please change my existing reservation as my plan to go for holiday trip got postponed?

ASSISTANT: I am here to help you about that. Can you please provide your name for checking the reservation status?

USER: I am Anthony Robinson.

ASSISTANT: Please wait for sometime to check in our booking list.

USER: Sure.

ASSISTANT: Sorry Anthony Robinson, there is no active reservation with your name in our booking list.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: You are welcome, thank you for choosing us.