You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you at this moment?

USER: I am Deborah Phillips. I want to cancel my reservation, due to my health issues. Will you help me in cancelling reservation?

ASSISTANT: Sure, can you give me a moment?

USER: Sure.

ASSISTANT: Congratulations, I have found your reservation, shall I cancel it?

USER: Sure.

ASSISTANT: Your ticket is been successfully cancelled, you will be refunded within 5 working days.

USER: Thanks for your service.

ASSISTANT: Thank you for opting us.