You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Nicholas Harris here. Please change my existing reservation to new locations.

ASSISTANT: Sure, I am here to help you with this.

USER: Thank you.

ASSISTANT: Please wait for a mean while.

USER: Sure, take your time.

ASSISTANT: Sorry Harris, there is no reservation found as per your name to change your reservation.

USER: It's ok, thanks for your information.

ASSISTANT: You are welcome.