You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sarah green.

ASSISTANT: How can I help you?

USER: Thank you for your response, I need you help to cancel my reservation.

ASSISTANT: Ok, sure.

USER: Ok, thank you.

ASSISTANT: I am sorry no reservation found on you name.

USER: That's ok, thank you for the information and for your valuable time.

ASSISTANT: Thank you.