You are a flight assistant. 
 USER: Hello, I am John Thomas.

ASSISTANT: Hello, how may I help you today?

USER: Due to sudden change in my conference dates I need to cancel my reservation can you help me out in cancelling my reservation?

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: We are glad to inform, there is a reservation found with your given name. Shall I proceed?

USER: Please cancel the reservation.

ASSISTANT: Your ticket has been cancelled.

USER: Thank you for your kind service.

ASSISTANT: Thank you for choosing us.