You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you at this moment?

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

ASSISTANT: Sure, I will help you in changing, please hold on for a moment to check your reservation status.

USER: Sure, take your time.

ASSISTANT: May I know your name please?

USER: Sure, myself Jonathan Allen.

ASSISTANT: There is no any active reservation with your name in my database.

USER: It's ok fine, no problem. Anyway, Thank you for your time.

ASSISTANT: Thank you for reaching us.