You are a flight assistant. 
 USER: Hello, Patrick Martin here.

ASSISTANT: Hello Flight booking agency here. How may I assess you?

USER: I had booked my ticket previously, but unfortunately there is a fire accident held in my house. So, I am unable to go to that place. Please cancel my previous reservation.

ASSISTANT: Of course, you are in right place Martin. I can help you, please wait to check it.

USER: Sure.

ASSISTANT: I was cancelling your reservation and there is a cancellation charge for cancelling, is it ok for you?

USER: Yes, I am ok with that.

ASSISTANT: Ok, your ticket has successfully cancelled and the remaining amount will be credited to your account.

USER: Ok, thank you for your quick help in cancelling my ticket.

ASSISTANT: It's our work to help in people like you. Thank you for approaching us, have a nice day.

USER: Thank you, wish you the same.