You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Katherine Thompson here.

ASSISTANT: Thompson, how can I aid you today?

USER: I want to cancel my ticket as I am sick.

ASSISTANT: Sure, I will help you with this. Please wait for a mean while.

USER: Sure.

ASSISTANT: Sorry Thompson, there is no active reservation by your name.

USER: No problem, thank you.

ASSISTANT: Most welcome.