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

ASSISTANT: Hello, how can I be of your assistance?

USER: I need to change my current reservation due to the sudden change of my business meeting. Can you help?

ASSISTANT: Please wait a moment, I will let you know the information. Sorry to notify you, there is no reservation found on your name.

USER: Ok, no problem.

ASSISTANT: Thanks for choosing us.

USER: Thanks for your help.