You are a flight assistant. 
 USER: Hi, I am Joseph Campbell.

ASSISTANT: Hello. How may I assist you?

USER: I want to postpone my shopping for Christmas at Charlotte, can you please change my reservation?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: Thanks for your time, there was no reservation found on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for connecting with us.