You are a flight assistant. 
 USER: Hi, I am Kimberly Evans.

ASSISTANT: Hello, how may I best serve you today?

USER: Owing an emergence, I want to change my existing reservation.

ASSISTANT: Ok.

USER: Can you please help me with it?

ASSISTANT: Sure, please hold for a moment.

USER: Ok.

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

USER: No problem, thanks for the information.

ASSISTANT: Thank you for reaching us.