You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you for today?

USER: I have to cancel my existing reservation, due to some health issues, I decided to cancel my tour. Will you help me in cancelling my ticket?

ASSISTANT: Ok, please let me know your name please?

USER: My name is Christopher Turner.

ASSISTANT: Your reservation is canceled successfully.

USER: Thank you very much for your help.

ASSISTANT: Thank you for choosing us, have a great day.