You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kenneth Lopez.

ASSISTANT: Lopez, how can I aid you today?

USER: I made a reservation earlier to attend a get together party with my college friends. Due to some issue in college it has been postponed. Can you please change my reservation?

ASSISTANT: Sure, I am happy to help you. Hold on for a moment. Let me check.

USER: Sure.

ASSISTANT: Sorry Lopez, there are no flights reserved on your given name.

USER: Ok, thanks for informing me.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.