You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: I want to change my reservation due to postponed of my exam, so please assist me in changing.

ASSISTANT: Sure, let me check the current status and revert you.

USER: Thank you for accepting my request.

ASSISTANT: May I know your name?

USER: Sure, my name is Kenneth Martinez from Detroit.

ASSISTANT: Ok, please give me a moment.

USER: Sure.

ASSISTANT: We could not find any reservation by the name you provided.

USER: No worries, thank you for your service.

ASSISTANT: Thank you for opting us.