You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Charles Collins.

ASSISTANT: How can I assist you today?

USER: I need to cancel my reservation due to my planned event got cancelled. So please help me with cancelling my reservation.

ASSISTANT: Sure, I am glad to help you to cancel your reservation.

USER: Thank you.

ASSISTANT: Sorry, no reservation found on your name.

USER: Oh! It may not be booked properly due to some technical issues. Anyway, thank you for your time.

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