You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is Katherine Davis. Can you please help me in changing my existing reservation details?

ASSISTANT: Sure, let me check your reservation status.

USER: Ok, take your time.

ASSISTANT: Davis, I have not found any reservation by your name in our database.

USER: That's ok, thank you for the information.

ASSISTANT: You are welcome, thank you for contacting us and have a nice day.