You are a flight assistant. 
 USER: Hello, I am Paul Miller.

ASSISTANT:  Hello, how can I assist you today?

USER: I would like to change my existing reservation as my plan to go for a holiday trip got postponed. Can you do the changes in my reservation?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thank you for waiting.

USER: Ok.

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

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for opting us.