You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I just want to change my recent reservation, as my NBA play offs match has been postponed. Can you help me to change it?

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: Sure, my name is Frank Wilson.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Frank Wilson, there is no active reservation found under your name to do modifications in that.

USER: Ok, thanks for your help.

ASSISTANT: Thank you for choosing us, have a great day.