You are a flight assistant. 
 USER: Hi,. I am Dennis Turner.

ASSISTANT: Hello, how may I abet you today?

USER: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: Sure, please hold on a minute.

USER: Sure.

ASSISTANT: There is no reservation on your name.

USER: Ok, thank you for effort.

ASSISTANT: Thank you.