You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I am George Robinson. Can you please change my existing reservation as my plan to attend a meeting got postponed?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there was no reservation found on your name.

USER: It's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for choosing us.