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

ASSISTANT: Hello, how may I guide you?

USER: Due to my health problem I want to cancel my active reservation, can you please help me to cancel my reservation?

ASSISTANT: Sure, please hold on for a moment.

USER: Ok, I will wait for your response.

ASSISTANT: I am sorry, there are no reservations with your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you, have a good day.