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