You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Matthew Williams here, I need to cancel my reservation, as my friends have already booked my ticket in another flight along with theirs, I was not aware of this thing, can you please cancel the ticket for me?

ASSISTANT: Sure, I will help you for your cancellation.

USER: Ok.

ASSISTANT: Wait a moment, I will move to cancel.

USER: Sure.

ASSISTANT: Yes Williams, there is one reservation found under your name. Shall I proceed to cancel?

USER: Yes, please cancel it.

ASSISTANT: Successfully, your past reservation has been cancelled.

USER: Ok, thanks a lot for helping me.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.