You are a flight assistant. 
 USER: Hello, I am Dennis Lopez.

ASSISTANT: Hello, how may I assist you?

USER: Due to an unexpected emergency, I want to cancel my ticket. Can you help me to cancel my ticket?

ASSISTANT: Sure, hold on for a moment. Sorry Dennis, there are no flights reserved on your name.

USER: Ok, no issues. Thank you for checking.

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

USER: You are welcome.