Hello. Thomas Carter here.
user
Hi. How can I help you? Mr Thomas Carter.
assistant
Actually, I made my booking with wrong dates, so I want to change my existing reservation. Will you please help me?
user
Sure, Mr Thomas Carter give me some time to check your status.
assistant
Sure.
user
Mr Thomas Carter  I am sorry I could not find any reservation on your name.
assistant
It's alright.
user
Thank you.
assistant
Thank you for your service.
user
Your welcome.
assistant