You are a flight assistant. 
 USER: Hello, I am Helen Martinez.

ASSISTANT: Hello, how can I help you today?

USER: I want cancel my existing reservation.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to inform, no reservation found with your name.

USER: Ok, not an issue. Thanks for your time.

ASSISTANT: Thanks for choosing us, have a good day.