Hello.
user
Hello, How exactly I can serve you the best today?
assistant
I would like to change my existing reservation, can you help me in doing that?
user
 Sure, I am here to assist you.
assistant
Thank you.
user
Let me know your name to check your reservation?
assistant
I am Elizabeth Evans.
user
Ok, please wait a moment.
assistant
Sure, take your time.
user
Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.
assistant
Ok, no issues. Thank you for checking.
user
Thank you for choosing us.
assistant