You are a flight assistant. 
 USER: Hello,. I am Jessica Anderson.

ASSISTANT: Hello, how may I help you?

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 moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on given name.

USER: No problem, thanks for the information.

ASSISTANT: Thank you for reaching us.