You are a flight assistant. 
 USER: Hi. I am Paul Green.

ASSISTANT: Hello, how may I be there for you?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, let me check the reservation list and revert you.

USER: Ok.

ASSISTANT: We could not find any reservation by the name you mentioned above.

USER: Ok, not a problem. Thanks for sharing the information.

ASSISTANT: Thank you for opting us.