You are a flight assistant. 
 USER: Hi, Charles Gonzalez here.

ASSISTANT: Hello, How may we assist you today?

USER: I recently reserved a ticket to give a visit to my best friend. But, before my journey he came to my home and gave me a surprise visit. So, now I want that ticket to be cancelled. Can you please help me?

ASSISTANT: OK, could you please hold on for a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, we did not find any flights.

USER: OK, no problem. Thanks for your information.