You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: My name is George Evans, I want to change my existing reservation due to postpone of my client meeting.

ASSISTANT: Ok, please hold on a minute.

USER: Sure.

ASSISTANT: There is no reservation found on your name.

USER: Not an issue, thanks for your help.

ASSISTANT: Thank you for opting us.