You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your good name, Please?

USER: I am Robert Baker, help me to change my reservation as my meeting got postponed.

ASSISTANT: Sure. We are very sorry to inform you that, We found no reservation on Robert Baker.

USER: Ok, thanks for the information.

ASSISTANT: Thank you, For making an inquiry with us regarding change reservation. Have a nice day.