Hello.
user
Hello, how can I oblige you today?
assistant
I am Helen Clark. I have to change my previous flight ticket booking, can you please help me in that?
user
Sure, please wait for a moment.
assistant
Thank you for considering my request in positive manner and I can wait for your reply.
user
Thank you for waiting, there is no reservation found on your name.
assistant
Ok, that's fine.No problem with that one. Thank you for your search and providing the information.
user
Thank you.
assistant
Welcome.
user