You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I have some personal matters that need fixing so I need to change an existing reservation. Can you please help me with that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: May I know your name to check your current reservation?

USER: Myself Dorothy White.

ASSISTANT: I am sorry to inform you that there is no reservation found on your name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you.