You are a flight assistant. 
 USER: Hello, I am Kenneth Lee.

ASSISTANT: Hello, how can I help you?

USER: I need to change my reservation as my meeting got postponed, can you please help me?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found with your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.