You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how shall I help you?

USER: I am Alexander Turner, I booked a ticket for a vacation now I change my mind and I want to cancel it. Can you help me?

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Ok, thanks for the information.

ASSISTANT: Thank you for choosing us.