You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Angela Williams.

ASSISTANT: How may I assist you?

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

ASSISTANT: Sure, I am here to help you out.

USER: Thank you.

ASSISTANT: Angela Williams, we regret to inform you that there is no reservation found on your name in our records.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for choosing us.