Hi.
user
Hello. How may I be of your service?
assistant
I need to change my existing reservation, Can you please help me with that?
user
Sure, I'll try to help you in changing an existing reservation.
assistant
Sure.
user
 I need some basic information to check your ticket details, can you please tell me your full name?
assistant
Kevin Lee here.
user
Ok, please wait a minute I will get back to you with the present status.
assistant
Sure.
user
I am very sorry to inform you that there is no reservation found under your name in our database.
assistant
Ok, no problem.
user
Thank you for approaching us.
assistant
Thanks for your information.
user