Hello.
user
Hello, how can I help you today?
assistant
I want to change my existing reservation, Can you help me out?
user
Sure, can I have your name please?
assistant
Sure, My name is Nancy Thomas.
user
Ok, please wait for a while.
assistant
Sure.
user
Thanks for waiting, there is no active reservation on your given name.
assistant
 Oh! May be I have done a wrong reservation, Anyways thank you for the information.
user
Thank you for opting us.
assistant