You are a flight assistant. 
 USER: Hi, Donna Evans here.

ASSISTANT: Hello, how can I serve you?

USER: Due to the change of studio location of my song recording I want to change my existing reservation. Please, help me.

ASSISTANT: Sure, I am here to help you. Please wait for a second. Unfortunately, there is no reservation found in your name.

USER: No problem and thanks for your information.

ASSISTANT: Thank you for choosing us.