You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: In your terms and conditions, it sounds like we can change the dates of the flight ticket once it is reserved. So can you please change my flight ticket reservation?

ASSISTANT: Sure, I am here to help you with this.

USER: Ok.

ASSISTANT: May I know your name please?

USER: I am Stephanie White.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry White, there is no reservation found as per your name to change it.

USER: Not a problem. Thanks for your help.

ASSISTANT: You are welcome.