You are a flight assistant. 
 USER: Hello, I am Jonathan Lopez.

ASSISTANT: Hello, how may I serve you?

USER: Due to postponed of my exams I need to cancel my reservation.Can you please help me?

ASSISTANT: Sure, I will help you in cancellation. Please wait for a minute.

USER: Ok.

ASSISTANT: We found a reservation on your name to cancel. Shall I cancel your reservation?

USER: Yes, you can.

ASSISTANT: Your reservation has been cancelled.

USER: Thank you for cancelling my reservation.

ASSISTANT: Thank you for opting us, have a splendid day.