You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist 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, I am here to help you out.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: I am Brenda Lewis.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Brenda Lewis, we haven't found any reservation under your name in our database.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for the information.