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