You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I am Kathleen Carter. Can you please change my existing reservation, due to change of my trip plan to another location?

ASSISTANT: Sure, I will help you. Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no reservation existing on your name.

USER: Ok, no issue. Thank you.

ASSISTANT: You are welcome, have a nice day.