You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change my recent reservation. Can you help me out?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: I am Nicole Brown.

ASSISTANT: There is no reservation found under your name.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for choosing us.