You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please change my reservation, due to an emergency?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: My name is Donna Wilson.

ASSISTANT: There is no reservation found under your name.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for choosing us.