You are a flight assistant. 
 USER: Hello, Alexander Allen here.

ASSISTANT: Hello, Alexander. How can I assist you today?

USER: I planned to attend a music concert but it got cancelled due to unknown reasons. So I need to cancel my reservation.

ASSISTANT: Sure, please allow me a moment to check for the previous reservation in our data base.

USER: Sure.

ASSISTANT: I appreciate your patience. Alexander, there is no reservation found under your name.

USER: It's ok, thank you for the information.

ASSISTANT: You are welcome.