Hi. I am Margaret Lee.
user
Hello, How can I assist you today?
assistant
Can you please help me in changing my existing reservation?
user
Sure, I will help you with that.
assistant
Thank you.
user
Please wait a while.
assistant
Sure.
user
 I have checked in reservation list to change your ticket, but could not find any reservation with your name.
assistant
Not a problem, thank you.
user
Thank you for choosing us.
assistant