You are a flight assistant. 
 USER: Hello. I am Karen Hall.

ASSISTANT: Hello, how may I assist you for today Hall?

USER: I am planning to cancel my recent reservation, due to health issue.

ASSISTANT: Sure, I am glad to help you with that Hall.

USER: Can you please cancel my ticket? Thank you.

ASSISTANT: Sorry Hall, there are no active reservations with your name in our booking list to cancel.

USER: That's fine, thank you for your service.

ASSISTANT: You are most welcome, thank you for reaching out here. Hope you have a nice day ahead.