You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: Myself Dennis Collins. I need to cancel my recent reservation due to health checkup, can you please help me out?

ASSISTANT: Sure, I will help you with that. Please wait for a while.

USER: Thank you for accepting my request.

ASSISTANT: I  cancelled your ticket successfully under your name.

USER: Thank you for cancelling my reservation.

ASSISTANT: Thank you for contacting us, have a great day.