You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Amy Brown.

ASSISTANT: How may I help you?

USER: I need to change my existing reservation, can you please help me out?

ASSISTANT: Sure, I am here to help you with that.

USER: Please proceed further.

ASSISTANT: Sorry to inform you, there is no active reservation on your name to change the details.

USER: Thank you for searching the details.

ASSISTANT: You are welcome. Thank you for reaching us.