You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I be of your service?

USER: Due to sudden change in my trip I need to change my existing reservation can you help me with the changes?

ASSISTANT: Sure, i will help you with that.

USER: Thank you.

ASSISTANT: May I know your name?

USER: I am Amanda Adams.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry Amanda, there is no active reservation on your name to change it.

USER: No problem. Thank you for the information.

ASSISTANT: Thanks for your Presence.