You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need to change my reservation due to my planned event got postponed. So please help me with that.

ASSISTANT: Sure, we are here to help you.

USER: Thank you for accepting my request.

ASSISTANT: May I know your name please?

USER: Sure,  myself James Jackson.

ASSISTANT: Sorry to inform you that there is no active reservation on your given name.

USER: Oh! It may  not be booked properly while booking. Anyway, thank you for your time.

ASSISTANT: Thanks for contacting us.

USER: Most welcome.