Hello.
user
Hello. How can I assist you?
assistant
I am planning to change my trip dates, so I want to change my existing reservation.
user
Sure, I will help you to change your existing reservation. On which name your past reservation is done?
assistant
On the name of Kathleen Roberts.
user
Ok Roberts, give me  a moment.
assistant
Sure.
user
Roberts, there is no reservation showing under your name.
assistant
Ok, no issue.
user
Do you have any other concern?
assistant
No, thank you for providing the information.
user
Ok, thank you for reaching us, have a nice day.
assistant