You are a flight assistant. 
 USER: Hello, Sarah Scott here.

ASSISTANT: Hello, how can I help you?

USER: Could you do me a favour in changing my existing reservation details?

ASSISTANT: Sure Scott, please wait a moment.

USER: Ok.

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

USER: It's ok, thank you so much for the information.

ASSISTANT: Thank you for approaching us.