You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, Good Morning.

USER: My name is Karen Lewis.

ASSISTANT: How may I guide you?

USER: Please cancel my existing reservation as my health is not good to travel.

ASSISTANT: Sure, hold on for a moment.

USER: Ok.

ASSISTANT: I found a reservation and cancelled it.

USER: Thank you.

ASSISTANT: Thank you, have a good day.