Hi.
user
 Hello, how may I render you today?
assistant
Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you please help me in changing the reservation?
user
Sure, may I know your good name?
assistant
I am Frank Allen.
user
I have checked in reservation list to change your ticket, but could not find any reservation with your name.
assistant
Sorry, there is no reservation by your name.
user
 Thank you for choosing us.
assistant