You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: My name is Karen Hill. I want to cancel my flight reservation as I am unwell, can you please help me?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry Karen, there is no active reservation found with your name in our records.

USER: No problem, thank you for checking.

ASSISTANT: Most welcome.