You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I need to cancel my recent reservation due to some health issue. Can you help me in cancellation?

ASSISTANT: I am sorry to know that. I will help you. Please help me with your name.

USER: I am Donna White.

ASSISTANT: Please allow me a minute.

USER: Ok, take your time.

ASSISTANT: Donna White, I have successfully cancelled your flight ticket.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching us. Have a great day.