You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can be a help for you today?

USER: I want to cancel my reservation can you help me?

ASSISTANT: Sure, it's my pleasure to help you. May I know your name please?

USER: My name is Stephen Baker.

ASSISTANT: I am sorry Stephen, there is no reservation found for you. Thank you for reaching us.

USER: OK.