You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Myself Rachel Lewis, I need to change my existing reservation as I have other plans this weekend. Please help me with it.

ASSISTANT: Sure, we are glad to help you.

USER: Thank you.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: Oh! not an issue, thank you for your information.

ASSISTANT: Thank you for reaching us.