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

ASSISTANT: Hello, Kathleen Clark. How can I help you for the day?

USER: As part of my schedule I made an earlier reservation to attend client meeting. Unfortunately, meeting got delayed on week. So I want to change my existing reservation. Can you please help me with this?

ASSISTANT: Sure. Please wait for a minute, We will get back to you with a valid response.

USER: OK.

ASSISTANT: We are very sorry to inform you that, There is no reservation found on Kathleen Clark.

USER: That's ok, not an issue.

ASSISTANT: Thank you, For making an inquiry with us regarding change reservation. Have a great day.

USER: Thank you for your helping hand.