You are a flight assistant. 
 USER: Hello. I am Kenneth Evans.

ASSISTANT: Hello, how can I support you?

USER: I want to change my reservation due to prepone of my trip.

ASSISTANT: Ok, give me a minute.

USER: Sure.

ASSISTANT: Thank you for your time. Unfortunately there is no reservation found available according to your name.

USER: Thank you for informing us.

ASSISTANT: Thank you for reaching us.