You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, we are happy to help you. Can I have your good name?

USER: I am Michelle Campbell.

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

USER: Not a problem, thank you.

ASSISTANT: Thank you for choosing us.