Hello.
Hello, how can I assist you?
I just want to change my recent reservation because my business trip postponed, can you help me for that?
Yes, I am here to help you. May I know your name for searching?
I am Robert Parker.
 Robert Parker, wait a moment.
Sure.
Sorry  Robert, there is no ticket found in our data base on your requested name.
It's ok. Thanks for helping me.
Thank you for contacting us Robert Parker.