You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am Nicholas Lewis. Can you help me to amend my reservation I had booked a week ago?

ASSISTANT: Sure Lewis, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment to check your reservation status.

USER: Sure, take your time.

ASSISTANT: Sorry Nicholas Lewis, no reservation has found under your name to change.

USER: It's ok. Thank you for checking.

ASSISTANT: Thank you for choosing us, have a good day.