You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Myself Nancy Jackson, I need to change my existing reservation can you please help me out?

ASSISTANT: Sure, I will help you. Please hold on for a moment.

USER: Please take your time.

ASSISTANT: Sorry Nancy, I did not find any reservation under your name in our records.

USER: Thank you for helping me in checking the details.

ASSISTANT: It's my pleasure, have a nice day.