You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Let me know your name to check the reservation status.

USER: Sure, I am Andrew Thomas.

ASSISTANT: Please, hold on a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, we found a reservation on your name. Shall I cancel it?

USER: Ok.

ASSISTANT: Your ticket has been cancelled successfully.

USER: Thank you for your great service.

ASSISTANT: Thank you for reaching us.