You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, I am here to help you. May I know your good name?

USER: I am Janet Baker.

ASSISTANT: Sorry, there is no active reservation on your name in our records.

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

ASSISTANT: Thank you for choosing us.