You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Actually, I have booked my flight to Denver last week to attend my cousin marriage.But, due to my exams got my exams got scheduled on the same day. So, I want to cancel my booking.

ASSISTANT: Sure, I will help you to cancel.

USER: Thank you for the positive response.

ASSISTANT: On which name your reservation has been booked?

USER: It was done on the name of Joseph Brown.

ASSISTANT: I found a reservation on your name, are you sure to cancel your reservation?

USER: Yes, I am sure please cancel it.

ASSISTANT: Your reservation has been cancelled.

USER: Thank you for your quick response.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.