You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I want to change my reservation due to some personal work, so please help me.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know on whose name I should change the reservation?

USER: Please check the reservation on the name of George Lopez.

ASSISTANT: Sorry no reservation found under your name.

USER: No worries, thank you.

ASSISTANT: Thank you for choosing us.