You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I amend you?

USER: My name is Frank Johnson. I want to cancel my ticket which was booked to Houston to visit Space Center, due to some security issue it has been closed.

ASSISTANT: Sure. Please wait a minute.

USER: Ok.

ASSISTANT: Thank you for your time. There is no reservation found according to your name.

USER: No issue, thank you.

ASSISTANT: Thank you.