You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Sure, can I know your name please to check the reservation status?

USER: Myself Kenneth Anderson.

ASSISTANT: Ok, wait a moment please.

USER: Ok.

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

USER: Not an issue.

ASSISTANT: Thank you for approaching us.

USER: Thank you.