You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Amy Nelson here.

ASSISTANT: How can I assist you for today?

USER: Please change my existing reservation.

ASSISTANT: Amy Nelson, can you please give me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry Amy Nelson, no reservation was found by your name.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for consulting with our agency.