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

ASSISTANT: Hello. How may I help you today?

USER: I need to change my existing reservation as my scheduled interview got postponed. Can you help me with it?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for opting us.