You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you for today?

USER: Jacob Moore here. I was made a reservation earlier in this week. But I want to change my reservation. Can you please help me for that?

ASSISTANT: Yes, I can help you. Sorry to inform you that there is no reservation found on your name.

USER: Anyway, thank you for the information.

ASSISTANT: Thank you for contacting us.