You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I wan to cancel my reservation as I am sick and can not make to the trip, can you please help?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: Sure, my name is Joshua Thomas.

ASSISTANT: Thank you, unfortunately there is no active reservation found in our data base.

USER: No problem, thank you.

ASSISTANT: Welcome, thank you for reaching us.