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

ASSISTANT: Hello, how can I assist you?

USER: I want to change an existing reservation, so please help me in changing the reservation.

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there was no reservation found on your name.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for choosing us.