You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Richard Nelson. Due to health problem I need to cancel my recent reservation.

ASSISTANT: Sure, Please wait for a moment.

USER: Ok.

ASSISTANT: Thank you for being patient, There is a reservation found on your specified name. Shall I proceed for cancellation?

USER: Yes, you can proceed.

ASSISTANT: Sure, your ticket has been cancelled.

USER: Thanks for your information.

ASSISTANT: Thank you for choosing us.