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

ASSISTANT: Hello, how may I assist you?

USER: I would like to change my reservation, as my brother came to my place to meet me. Can you please help me?

ASSISTANT: Sure, please wait.

USER: Ok.

ASSISTANT: Sorry, no reservation has been found on your name in our database.

USER: That's fine, thank you for checking.

ASSISTANT: Thank you for choosing us.