You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, may I know your name please?

USER: My name is Jeffrey Campbell.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Sorry to inform you that there is no active reservation found with your name in our records.

USER: Anyway, thanks for the information.

ASSISTANT: Most welcome.