You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Can you change my flight ticket reservation? As I want to go for a stopover for in my business trip to Las Vegas.

ASSISTANT: Sure, I am glad to help you.

USER: Ok.

ASSISTANT: May I know your good name?

USER: I am Amanda Collins.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: There is no reservation found on your name in our database.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for opting us.