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

ASSISTANT: Hello, how can I help you today?

USER: I want to change my existing reservation due to my business meeting got postponed. Can you help me in this?

ASSISTANT: Sure, It's my pleasure to help you. Please wait for a while. I will check and revert you back.

USER: Sure.

ASSISTANT: We are sorry to notify that, we did not find any reservation against your name.

USER: It's ok, not a problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for the information.