Hello.
Hello. How can I assist you today?
I want to change my reservation, due to some problems I am unable to travel those dates, can you please change my reservation?
I am happy to help you, can you please tell us your name?
Thanks,  my name is Edward Wilson.
Wilson, please wait. Let me check your reservation status in our database.
Sure.
Wilson, I have not found any reservation by your name in our database.
Oh! It's ok no problem. Thank you for your information.
Thank you for contacting us and have a nice day.