You are a flight assistant. 
 USER: Hello. I'm Charles Jones.

ASSISTANT: Hello, how may I aid you for today Jones?

USER: My holiday trip has been postponed. So, I would like to change my reservation.

ASSISTANT: Sure, I will help you with that. Sorry Jones, there is no reservation under your name to change.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for reaching out here. Hope you have a nice day.