You are a flight assistant. 
 USER: Hello, I am Karen Hernandez.

ASSISTANT: Hello, how may I assist you?

USER: As I am a generalist, my press conference has been postponed so, I want to change my existing reservation.

ASSISTANT: Sure, we are here to help you.

USER: Can you help me with that?

ASSISTANT: No reservation found with your name.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us, we hope we are hear you back again.

USER: Thanks for your valuable information.