You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Myself Elizabeth Campbell. I want to change my existing reservation due to some changes in my plans. Can you help me in that?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry Elizabeth Campbell, there is no active reservation on your name.

USER: Ok, not an issue.

ASSISTANT: Thank you.

USER: Thank you.