You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I aid you?

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, May I know your name please?

USER: Sure, I am Donna Anderson.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Thank you for waiting, There is no reservation found on you name.

USER: Ok, Thank you.

ASSISTANT: Thank you have a nice day.