You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Justin Gonzalez. I have a change of mind, As I plan to visit Dallas for my holiday, because that's nearer to my home. So, please change my reservation.

ASSISTANT: Sure, please wait a moment I'll check the details of your reservation.

USER: Ok.

ASSISTANT: Sorry for the inconvenience, no reservation found on your name.

USER: Thanks for your information.

ASSISTANT: Thanks for approaching us. Have a nice day.