You are a flight assistant. 
 USER: Hello, I am Nicholas White.

ASSISTANT: Hello, Nicholas White. How may I help you today?

USER: I want to change my existing reservation.Can you please assist me with this?

ASSISTANT: Sure. Please wait for a minute. Thanks for being patience.

USER: Ok.

ASSISTANT: We found that there was no reservation found with your name.

USER: That's Ok, not an issue. Thank you for your service.

ASSISTANT: Thanks for opting us.