You are a flight assistant. 
 USER: Hello, I am Carol Young.

ASSISTANT: Hello, How can I provide service to you?

USER: Due to some changes in my conference meeting dates I need to change my existing reservation can you help me with the changes?

ASSISTANT: Sure, we are here to aid you.

USER: Thank you.

ASSISTANT: Please be on hold for a second.

USER: Sure.

ASSISTANT: Sorry, we did not find any active reservation in your name.

USER: No problem. Thank you for the information.

ASSISTANT: Thanks for your approach.