You are a flight assistant. 
 USER: Hi, I am Helen Davis.

ASSISTANT: Hello,. How can I oblige you today?

USER: Owing to an emergency, my business conference got cancelled. So I request you to cancel my existing reservation.

ASSISTANT: Sure, we are here to aid you. Please stay online, I will check the reservation list whether your name is there or not.

USER: Sure.

ASSISTANT: Thanks for your time, we found a reservation with your name. Your ticket has been cancelled.

USER: Thank you for your kind service.

ASSISTANT: Thank you for reaching us.