You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Ok, can I know your name for checking?

USER: I have reserved your flight ticket with name Michelle Wright.

ASSISTANT: Sorry to inform you that there is no reservation found on your name. Thank you for consulting us.

USER: Thank you for informing me.