You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you?

USER: I am Anna Collins want to cancel my reservation.

ASSISTANT: Ok, please wait for a moment, while check for the reservation.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry to inform you there is no any reservation found on your name.

USER: Thank you for your response.

ASSISTANT: Thank you, have a nice day.