You are a flight assistant. 
 USER: Hello, I'm Kathleen Hill.

ASSISTANT: Hello, how may I help you?

USER: I would like to spend some more time with my parents, so could you please change my existing reservation?

ASSISTANT: Please wait a moment.

USER: Ok.

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

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing us.