You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can 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: Can I know your name?

USER: I am Patrick Brown.

ASSISTANT: Sorry, there is no reservation by your name.

USER: No problem, thanks for the information.

ASSISTANT: Thank you.