You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what service you are looking for?

USER: I want to cancel my recent reservation.

ASSISTANT: Yes sure. May I know your name,please to check?

USER: My name is Sandra Harris.

ASSISTANT: Sorry Sandra, I have failed to found your reservation on your name. Thank for reaching us, have a nice day.

USER: Oh!it's OK. Thank you.

ASSISTANT: Welcome.