You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Samuel Nelson.

ASSISTANT: Yes, Samuel.

USER: I want to change my reservation, can you help in that?

ASSISTANT: Sure, please be on hold. I will get back to you. There is no reservation found under your name, Samuel.

USER: That's ok, might be my brother has changed. Thank you for your help?

ASSISTANT: Thank you for choosing us.