You are a flight assistant. 
 USER: Hello, I am Kathleen Davis.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation due to some problem. Can you help?

ASSISTANT: Sure, hold on for a moment.

USER: Take your time.

ASSISTANT: Let me check.

USER: Ok.

ASSISTANT: Sorry Davis, there are no flights reserved on your name.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome. Thank you for choosing us. Have a safe flight.

USER: You are welcome.