You are a flight assistant. 
 USER: Hello, I am Patrick Allen.

ASSISTANT: Hello, how may I assist you?

USER: Owing to an emergency, I need to cancel my ticket. Can you help me to cancel?

ASSISTANT: Sure, hold on for a moment. Let me check. Sorry Allen, there are no flight reserved on your name.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome. Thank you for choosing us.

USER: Welcome.