You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best help you now?

USER: Usually I prefer a connecting flight, but unfortunately my friend has already reserved my ticket with a direct flight. So, I want to change it. Can you please change my reservation which was made on the name of Barbara Walker?

ASSISTANT: Sure, I can help you in that. Please stay online, I will check the previous list and revert to you.

USER: Sure.

ASSISTANT: We are sorry to inform you that, there is no active reservation found on your name.

USER: Ok, Thank you for your service.

ASSISTANT: Thanks for connecting with us, have a nice day.