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: Sure, I am here to help you with that, can I know your good name to proceed further?

USER: I am Ryan Jackson.

ASSISTANT: Sorry, we found no reservation on your given name.

USER: Thank you for the help.

ASSISTANT:  Thank you for choosing us.