Hi.
Hello.
I am Kenneth Wilson.
Kenneth, how can I guide you today?
I have some work in Houston only so I have to stay there, so can you help me for changing my existing reservation?
Sure, please wait for a moment.
Ok, I will wait for your reply.
Sorry Wilson, no reservation found on your name in our database.
Oh! I think my sister's already changed my reservation, anyway thank you for your services.
Thank you, have a great day.