You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: My name is Jerry Smith.

ASSISTANT: Ok.

USER: Due to postpone of my business meeting, I want to change my existing reservation.

ASSISTANT: Ok. I will help you in this by checking the reservation list. Please wait, I will revert to you.

USER: Sure.

ASSISTANT: I have gone through the reservation list, but your name is not existed.

USER: Not an issue, thanks for your help.

ASSISTANT: Thank you. Have a nice day.