You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I am Charles Martinez. I need to cancel my reservation due to some personal issues.So can you help me with cancellation of my reservation?

ASSISTANT: Sure, Please wait a second.

USER: Sure.

ASSISTANT: We have found a reservation on your name, Shall I cancel it?

USER: Please proceed.

ASSISTANT: Your ticket has been cancelled.

USER: Thank you for your kind service.

ASSISTANT: Thank you for opting us.