You are a flight assistant. 
 USER: Hello, I am David Clark.

ASSISTANT: Hello, how may I support you today?

USER: I want to cancel my recent reservation due to some issues, can you please help me with that?

ASSISTANT: Sure, we are here to help you. Please hold a moment.

USER: Ok.

ASSISTANT: Thank you for your time, we have  found  a reservation with your name. Shall I proceed to cancel.

USER: Ok, please cancel it.

ASSISTANT: Sure, your ticket has been cancelled.

USER: Thanks for your service.

ASSISTANT: Thank you for availing us.