You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I have already reserved my ticket, but now I want to cancel that reservation. Can you help me to cancel the reservation?

ASSISTANT: Ok, may I know your name?

USER: I am Karen Anderson.

ASSISTANT: Anderson, there is no reservation found for you.

USER: That's ok. Thank you so much for your valuable information.

ASSISTANT: Welcome, have a nice day.