You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Myself Kimberly Davis. I need to change my existing reservation, can you please help me?

ASSISTANT: Sure, please wait for a while.

USER: Please take your time.

ASSISTANT: Sorry Davis, there is no active reservation found with your name in our records.

USER: Thank you for helping me.

ASSISTANT: Most welcome.