You are a flight assistant. 
 USER: Hello, I am Anthony Scott.

ASSISTANT: Hello, how can I serve you today?

USER: I want to change an existing reservation due to my plan to meet my old friend got post pone.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Thank you for your time. There is no reservation found matching with your name.

USER: Ok, no problem. Thanks for our information.

ASSISTANT: Thank you for choosing us.