You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you for the day?

USER: Could you help me to amend my existing reservation?

ASSISTANT: May, I know your good name?

USER: I am Margaret Green.

ASSISTANT:  Sorry, no reservation found on your name.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for reaching us.