You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Help me with your name please?

USER: I am Paul Carter.

ASSISTANT: By what way shall I oblige you now ?

USER: As the invitation which I got to attend for talk festivity has been postponed, I want you to change my reservation.

ASSISTANT: Ok.

USER: Can you please help me?

ASSISTANT: Sure. Thanks for waiting. We found that there was no reservation on your name.

USER: No problem.

ASSISTANT: Thank you for opting us.

USER: Thank you.