You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I am Joseph Lee. I would like to cancel my existing flight ticket that has been booked earlier this week. Could you please help me in cancelling my flight ticket?

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

USER: Sure, please take your time.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: Ok, no problem. Thank you for the information.

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