Hi.
user
Hello, how may I aid you today?
assistant
 I need to change my existing reservation as my exams got postponed, Can you please help me with that?
user
Let me know your name to check your reservation?
assistant
Angela Lewis here.
user
Please wait for a moment.
assistant
Sure.
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
No problem, thanks for the information.
user
Thank you for reaching us.
assistant