You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: Robert Martin  here. I will be cancelling my reservation which I have booked few weeks ago due to my office work, can you please help me?

ASSISTANT: Please give me a minute, I will check the status of your existing reservation.

USER: Ok, let me know my previous booking status after checking.

ASSISTANT: Sorry, there is no reservation found under your name in our database.

USER: Oh! Than's fine, maybe my assistant have cancelled my reservation already.

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

USER: Thank you for checking for my previous reservation. Welcome.