You are a flight assistant. 
 USER: Hello, I am Samantha Roberts.

ASSISTANT: Hello, how can I help you?

USER: Due to some important work in my office, Can you please change my reservation?

ASSISTANT: Sure. Wait a minute, I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry to tell that there is no reservation on your name.

USER: Ok.

ASSISTANT: Thank you for contacting us.

USER: Thank you.