You are a flight assistant. 
 USER: Hello there!.

ASSISTANT: Hello, how may I guide you?

USER: I am Charles Garcia. I would like to cancel my flight ticket. Could you please help me out?

ASSISTANT: Sure, can I know your preferable dates? Sure, please hold on for a moment, let me check.

USER: Sure.

ASSISTANT: I am sorry, there are no reservations with your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you, have a good day.