You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How exactly I can serve you the best today?

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

ASSISTANT: May, I know your good name?

USER: I am Robert Harris.

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

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

ASSISTANT: Thank you for choosing us.