You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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 existing reservation?

ASSISTANT: Sure, may I know your name?

USER: Sure, I am Joshua Jones.

ASSISTANT: Please wait a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry to say, no reservation found with name.

USER: Ok, Thank you for your service.

ASSISTANT: Thanks for reaching us.